Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
toc hieu » toc thieu, doc hieu, hoc thieu
dat hang » dat khanh, dat quang, tat thang
van dung » van dong, xay dung, tin dung
phan lap » phan dau
cong so » cong san, cong hoa
so phan » co phan, hoc phan, hoa phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc hieu lang - thanh cong ((dat hang) or (van dung)) cong so phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc hieu lang - thanh cong ((dat hang) OR (van dung)) cong so phan lap.
• Adding a wildcard symbol may retrieve word variants: toc hieu lang - thanh cong ((dat hang) or (van dung)) cong so phan lap*.