Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc chinh » hoan chinh, hoc sinh, hoc kinh
vat dung » van dung, viet dung, mat duong
tran huu » tran duc
toan tap » toan ban
va dung » van dung, va duong, va ung

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

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