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
than cau » toan cau, phan cau, thanh chau
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 ((than cau) OR (than cap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - lanh manh cua thong cong tan ((than cau) OR (than cap))".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - lanh manh cua thong cong tan ((than cau) OR (than cap))*.