Perhaps you should try some spelling variations:
thanh trung » thanh tung
tong cong » trong cong, cong cong, dung cong
trung va » truong va, trang va, trung ha
cong tan » cong tac, cong san, cong thanh
tran ban » tranh ban, toan ban, tran bai
tran van » luan van
va tong » va thong, va tuong, va trong

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc hien) or (theo tieu)) xanh - thanh trung va tong cong tan ((tran ban) OR (tran van))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hien) OR (theo tieu)) xanh - thanh trung va tong cong tan ((tran ban) OR (tran van)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hien) or (theo tieu)) xanh - thanh trung va tong cong tan ((tran ban) OR (tran van))".
• Adding a wildcard symbol may retrieve word variants: ((hoc hien) or (theo tieu)) xanh - thanh trung va tong cong tan ((tran ban) OR (tran van))*.