Perhaps you should try some spelling variations:
thanh trung » thanh tung
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
trung cam » trung tam, trung cap, trung nam
nhung don » nhung van, nhung bo
manh toan » thanh toan, anh tuan, tinh toan
hoc hieu » hoc thieu, hoc hien, doc hieu
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu lang - thanh trung cam ((nhung don) or (thong cong)) manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - thanh trung cam ((nhung don) OR (thong cong)) manh toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - thanh trung cam ((nhung don) or (thong cong)) manh toan ban*.