Perhaps you should try some spelling variations:
"te sach danh ky thuat cho hoc" » "te sach tranh ky thuat cho hoc", "te sach dung ky thuat cho hoc", "te sach kinh ky thuat cho hoc", "te sach danh ky thuat cheo hoc", "te sach danh ky thuat choi hoc", "te sach danh ky thuat che hoc", "toc sach danh ky thuat cho hoc", "te sach hanh ky thuat cho hoc", "te sach dan ky thuat cho hoc", "te sach dang ky thuat cho hoc", "te sach danh ky thuat khoa hoc"
"tu sach dao ky thuat co hoc" » "tu lanh dao ky thuat co hoc", "tu sach dao ky thuat do hoc", "tu sach dao ky thuat o hoc", "thu sach dao ky thuat co hoc", "su sach dao ky thuat co hoc", "tu cach dao ky thuat co hoc", "tu sach cao ky thuat co hoc", "tu sach dan ky thuat co hoc", "tu sach do ky thuat co hoc"

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 danh ky thuat cho hoc") or ("tu sach dao ky thuat co hoc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("te sach danh ky thuat cho hoc") OR ("tu sach dao ky thuat co hoc")).
• Removing quotes may allow a broader search: (( te sach danh ky thuat cho hoc ) or ( tu sach dao ky thuat co hoc )).
• Adding a wildcard symbol may retrieve word variants: (("te sach danh ky thuat cho hoc") or ("tu sach dao ky thuat co hoc"))*.