Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tien manh » tien anh, tien thanh, tieng anh
trinh van » trinh quan, trinh toan, dinh van
trinh han » trinh quan
hoc tien » hoc tieng, hoc hien, hoc vien
cong san » cong tac
cac cau » cac mau, bac cau, ca cau
van hau » van ha, van hai, van dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc tien manh - canh ((trinh van) OR (trinh han)) nhung cong san ((cac cau) or (van hau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tien manh - canh ((trinh van) OR (trinh han)) nhung cong san ((cac cau) OR (van hau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc tien manh - canh ((trinh van) OR (trinh han)) nhung cong san ((cac cau) or (van hau))".
• Adding a wildcard symbol may retrieve word variants: hoc tien manh - canh ((trinh van) OR (trinh han)) nhung cong san ((cac cau) or (van hau))*.