Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien tinh » khien tinh, thien tinh, bien tinh
trung vap » trung cap, trung va, trung van
vap nhung » va nhung, ve nhung, voi nhung
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
phan cac » nhan cach, phan lap, phan van
phan dau » phan tu, hang dau

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien tinh - thanh trung vap nhung ((cong tan) OR (cong san)) ((phan cac) OR (phan dau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien tinh - thanh trung vap nhung ((cong tan) OR (cong san)) ((phan cac) or (phan dau))~".
• Adding a wildcard symbol may retrieve word variants: hoc hien tinh - thanh trung vap nhung ((cong tan) OR (cong san)) ((phan cac) or (phan dau))*.