Perhaps you should try some spelling variations:
"thuat sach than ky thuat co hoc" » "thuat lanh than ky thuat co hoc", "thuat san than ky thuat co hoc", "thuat sach tham ky thuat co hoc", "thuat sach han ky thuat co hoc", "thuat sach tranh ky thuat co hoc", "thuat sach than ky thuat do hoc", "thuat sach than ky thuat o hoc"
"tu ban trinh do thuat tran khoa" » "tu ban trinh do thuat trang khoa", "tu ban trinh do thuat toan khoa", "tu ban trinh do thuat than khoa", "tu ban tinh do thuat tran khoa", "tu dan trinh do thuat tran khoa", "tu van trinh do thuat tran khoa", "tu ban trinh do thuat san khoa", "tu ban trinh do thuat nhan khoa", "tu ban trinh ky thuat tran khoa", "tu ban trinh hoc thuat tran khoa", "tu ban trinh ki thuat tran khoa", "tu ban trinh do thai tran khoa", "thu ban trinh do thuat tran khoa", "te ban trinh do thuat tran khoa"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("thuat sach than ky thuat co hoc") or ("tu ban trinh do thuat tran khoa"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("thuat sach than ky thuat co hoc") OR ("tu ban trinh do thuat tran khoa"))*.
• Removing quotes may allow a broader search: (( thuat sach than ky thuat co hoc ) or ( tu ban trinh do thuat tran khoa ))*.