Perhaps you should try some spelling variations:
"tu can trinh kxy thuat san ho" » "tu can tranh kxy thuat san ho", "tu dan trinh kxy thuat san ho", "tu van trinh kxy thuat san ho", "tu can trinh ky thuat san ho", "tu can trinh ly thuat san ho", "tu can trinh ke thuat san ho", "tu can trinh ki thuat san ho", "tu can trinh my thuat san ho", "tu can trinh ky thua san ho", "tu can trinh kxy thuat toan ho", "tu can trinh kxy thuat song ho", "tu can trinh kxy thuat lanh ho", "tu ban trinh kxy thuat san ho", "tu cac trinh kxy thuat san ho", "thu canh trinh kxy thuat san ho", "tu can trinh kxy thuat san cho", "tu can trinh kxy thuat san co", "tu can trinh kxy thuat sin ho"
"te sach ngan ky thuat do hoc" » "te sach ngon ky thuat do hoc", "te sach nha ky thuat do hoc", "te sach han ky thuat do hoc", "te sach ngan ky thuat o hoc", "toc sach ngan ky thuat do hoc", "te sach nganh ky thuat do hoc", "te sach nhan ky thuat do hoc", "te sach ngan hay thuat do hoc", "te sach ngan ky thuat co hoc", "te sach ngan ky thuat do hoa", "te sach ngan ky thuat du hoc"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("te sach ngan ky thuat do hoc") or ("tu can trinh kxy thuat san ho"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("te sach ngan ky thuat do hoc") OR ("tu can trinh kxy thuat san ho")).
• Removing quotes may allow a broader search: (( te sach ngan ky thuat do hoc ) or ( tu can trinh kxy thuat san ho )).
• Adding a wildcard symbol may retrieve word variants: (("te sach ngan ky thuat do hoc") or ("tu can trinh kxy thuat san ho"))*.