Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
hoc chinh » hoan chinh, hoc sinh, hoc kinh
dung cong » dung trong
tranh va » tranh van, trinh va, thanh va
trang va » tran van, hang va
tran huu » tran duc
toan cau » toan cao, toan ban, toan tap

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 - canh ((tranh va) OR (trang va)) dung cong thanh ((tran huu) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chinh sach - canh ((tranh va) OR (trang va)) dung cong thanh ((tran huu) OR (toan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chinh sach - canh ((tranh va) OR (trang va)) dung cong thanh ((tran huu) or (toan cau))".
• Adding a wildcard symbol may retrieve word variants: hoc chinh sach - canh ((tranh va) OR (trang va)) dung cong thanh ((tran huu) or (toan cau))*.