Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
hanh doanh » hang doanh, chinh doanh, kinh doanh
tuong manh » duong manh, luong manh, tung manh
hieu lang » chieu sang, hieu quang, nhieu tang
manh toan » thanh toan, anh tuan, tinh toan
doi hieu » doi chieu, doc hieu, doi hien
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: doi hieu lang - ((hanh doanh) or (doanh doanh)) ((cua nhung) OR (va nhung)) tuong manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - ((hanh doanh) OR (doanh doanh)) ((cua nhung) OR (va nhung)) tuong manh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - ((hanh doanh) or (doanh doanh)) ((cua nhung) OR (va nhung)) tuong manh toan ban".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - ((hanh doanh) or (doanh doanh)) ((cua nhung) OR (va nhung)) tuong manh toan ban*.