Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
hanh hang » thanh hang, hang hang, hanh han
nho hieu » nha hieu, nho sieu, nhu hieu
va thong » va thuong, va phuong, he thong
cong san » cong tac
toan tai » toan tap, doanh tai, toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: nho hieu lang - hanh hang va thong cong san ((toan tai) or (van ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho hieu lang - hanh hang va thong cong san ((toan tai) OR (van ban)).
• Adding a wildcard symbol may retrieve word variants: nho hieu lang - hanh hang va thong cong san ((toan tai) or (van ban))*.