Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
cong hanh » cong thanh, cong khanh, hong hanh
dung cong » dung trong
phan cau » phan cac, phan tu, phan lap
phan dau » phan tu, hang dau
ho hieu » ho chieu, hoi hieu, nho 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 lang - thanh cong hanh ((dung cong) or (thong cong)) tac ((phan cau) OR (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - thanh cong hanh ((dung cong) OR (thong cong)) tac ((phan cau) OR (phan dau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - thanh cong hanh ((dung cong) or (thong cong)) tac ((phan cau) OR (phan dau))".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - thanh cong hanh ((dung cong) or (thong cong)) tac ((phan cau) OR (phan dau))*.