Perhaps you should try some spelling variations:
nhanh mang » nhanh lang, hanh mang, nhanh quang
hieu lang » chieu sang, hieu quang, nhieu tang
dang cong » dung cong
hieu van » hieu va, thien van, lieu va
cong tac » cong ty
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap
mang va » mang vua, hang va, bang va
va dang » van dang, va nang, va lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu lang) or (hieu van)) - nhanh mang va dang cong tac ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (hieu van)) - nhanh mang va dang cong tac ((toan cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (hieu van)) - nhanh mang va dang cong tac ((toan cau) or (toan cao))*.