Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu lang » chieu sang, hieu quang, nhieu tang
thanh cac » hanh cac, thanh bac, thanh ca
doc hieu » toc thieu, hoc thieu, hoc hien
tung cap » trung cap, cung cap, thong cap
cap dung » ap dung, cao dung, chan dung
cong dan » cong tan, huong dan, cong dong
cong san » cong tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu lang - thanh tung cap dung ((cong dan) OR (cong san)) thanh cac~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu lang - thanh tung cap dung ((cong dan) OR (cong san)) thanh cac".
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - thanh tung cap dung ((cong dan) OR (cong san)) thanh cac*.