Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
sinh sach » chinh sach, sinh san, sang sach
dung cong » dung trong
tranh va » tranh van, trang va, trinh va
tran huu » tran duc
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sinh sach - hanh tranh va dung cong trinh ((tran huu) or (((toan cau) or (toan tap))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sinh sach - hanh tranh va dung cong trinh ((tran huu) OR (((toan cau) OR (toan tap)))).
• Adding a wildcard symbol may retrieve word variants: hoc sinh sach - hanh tranh va dung cong trinh ((tran huu) or (((toan cau) or (toan tap))))*.