Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hanh tranh » canh tranh, hanh trang, lanh tranh
cong thanh » dong thanh, cong trinh, cong tan
kinh sach » sinh sach, dinh sach, tinh sach
dung cong » dung trong
hoc kinh » hoc sinh, luoc kinh
tran huu » tran duc
toan ban » van 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 kinh sach - ((hanh tranh) or (hanh trinh)) va dung cong thanh ((tran huu) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc kinh sach - ((hanh tranh) OR (hanh trinh)) va dung cong thanh ((tran huu) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc kinh sach - ((hanh tranh) or (hanh trinh)) va dung cong thanh ((tran huu) or (toan ban))*.