Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
lang van » dang van, tang van, hoang van
dieu cua » dieu tra
va thanh » gia thanh, ban thanh, va tinh
nang xa » nang x, lang xa, nang ma
cac hoc » cach hoc, cac hop, bac hoc
te san » te ban, ke san, tu san
san ky » sang ky, van ky, dan ky
cua tu » cua tuc, cua su, cua te
cua cu » cua chu, cua cau, cua su

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)) hoi. dieu cua cac hoc va thanh dai ((cua tu) or (cua cu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te san ky ((nang xa) OR (lang van)) hoi. dieu cua cac hoc va thanh dai ((cua tu) OR (cua cu)).
• Adding a wildcard symbol may retrieve word variants: te san ky ((nang xa) or (lang van)) hoi. dieu cua cac hoc va thanh dai ((cua tu) or (cua cu))*.