Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
trinh vat » trinh luat, sinh vat, trinh han
trinh van » trinh han, trinh quan, trinh toan
hoi hieu » hoi phieu, hoi tieu, moi hieu
cong dan » cong san, cong tan, huong dan
dan phan » doan phan, dan chan, van phan
phan dau » phan tu, hang dau
ho hieu » ho chieu, nho hieu, co hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho hieu) or (hoi hieu)) lang - hanh ((trinh vat) OR (trinh van)) nhung cong dan phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho hieu) OR (hoi hieu)) lang - hanh ((trinh vat) OR (trinh van)) nhung cong dan phan dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho hieu) or (hoi hieu)) lang - hanh ((trinh vat) OR (trinh van)) nhung cong dan phan dau".
• Adding a wildcard symbol may retrieve word variants: ((ho hieu) or (hoi hieu)) lang - hanh ((trinh vat) OR (trinh van)) nhung cong dan phan dau*.