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 cau » toan cao, toan ban, toan tap
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 cau))~.
• 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 cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chinh sach - hanh tranh ((va dung) OR (vat dung)) cong thanh ((tran huu) or (toan cau))".
• Adding a wildcard symbol may retrieve word variants: hoc chinh sach - hanh tranh ((va dung) OR (vat dung)) cong thanh ((tran huu) or (toan cau))*.