Perhaps you should try some spelling variations:
truong thanh » truong trung, truong thpt, truong chung
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc chinh » hoan chinh, hoc sinh, hoc kinh
tranh va » tranh van, trang va, trinh va
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 chinh sach - hanh tranh va dung ((dong thanh) OR (truong thanh)) ((tran huu) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chinh sach - hanh tranh va dung ((dong thanh) OR (truong thanh)) ((tran huu) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chinh sach - hanh tranh va dung ((dong thanh) OR (truong thanh)) ((tran huu) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc chinh sach - hanh tranh va dung ((dong thanh) OR (truong thanh)) ((tran huu) or (toan ban))*.