Perhaps you should try some spelling variations:
bang duong » bang suong, bang tuong, tang duong
duong manh » duong van
hieu lang » chieu sang, hieu quang, nhieu tang
hieu quan » hieu qua, lieu quan, thien quan
trang cua » tranh cua, tang cua, trung cua
trung cap » truong cao, trung tam
manh toan » thanh toan, anh tuan, tinh toan
toan cau » toan cao, toan ban, toan tap

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) or (hieu quan)) - hanh ((trang cua) or (trung cap)) bang duong manh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu quan)) - hanh ((trang cua) OR (trung cap)) bang duong manh toan cau.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (hieu quan)) - hanh ((trang cua) or (trung cap)) bang duong manh toan cau*.