Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
dang xay » dang van, van xay
vanh tai » van tai, hanh tai, anh tai
nang xa » nang x, lang xa, nang ma
qua cac » cua cac
cac hoc » cach hoc, cac hop, bac hoc
va vanh » va van, va danh, va hanh
tai cua » thai cua, tai cuc, tri cua
te san » te ban, ke san, tu san
san ky » sang ky, van ky, dan ky
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te san ky ((nang xa) or (((lang van) or (dang xay)))) hoi. hieu qua cac hoc va vanh tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te san ky ((nang xa) OR (((lang van) OR (dang xay)))) hoi. hieu qua cac hoc va vanh tai cua tu.
• Adding a wildcard symbol may retrieve word variants: te san ky ((nang xa) or (((lang van) or (dang xay)))) hoi. hieu qua cac hoc va vanh tai cua tu*.