Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
lanh manh » lanh tranh, lan anh, van manh
cua thong » cua thuong, cua khong, cua tong
doi hieu » doi chieu, doc hieu, doi hien
manh cua » doanh cua, ban cua
cong tan » cong tac, cong san, cong thanh
thanh ha » thanh hoa, thanh hai, nhanh ha
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - lanh manh cua thong cong tan ((thanh ha) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - lanh manh cua thong cong tan ((thanh ha) OR (than cap)).
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - lanh manh cua thong cong tan ((thanh ha) or (than cap))*.