Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
hoc trieu » hoc thieu, hoc tieu, hoc dieu
hanh tang » hanh trang, anh tang, hanh tung
hanh mang » nhanh mang, hanh trang, nhanh lang
cua dung » cua dang, cua dong, qua dung
cong tac » cong ty
tran ban » tranh ban, tran van, toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc trieu tinh - ((hanh tang) OR (hanh mang)) cua dung ((cong tac) or (cong thanh)) tran ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc trieu tinh - ((hanh tang) OR (hanh mang)) cua dung ((cong tac) OR (cong thanh)) tran ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc trieu tinh - ((hanh tang) OR (hanh mang)) cua dung ((cong tac) or (cong thanh)) tran ban".
• Adding a wildcard symbol may retrieve word variants: hoc trieu tinh - ((hanh tang) OR (hanh mang)) cua dung ((cong tac) or (cong thanh)) tran ban*.