Perhaps you should try some spelling variations:
tang van » dang van, hoang van, trong van
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
hoc vat » hoc va, hoc viet, thuc vat
vi cua » vai cua, di cua
te sac » te sach, te cac, te san
ve cac » va cac, vien cac
sac ky » cac ky, sai ky
cua tu » cua tuc, cua su, cua cu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((nang xa) OR (tang van)) hoi. hieu ve cac ((hoc vat) OR (vo van)) hanh vi cua tu~.
• Adding a wildcard symbol may retrieve word variants: te sac ky ((nang xa) or (tang van)) hoi. hieu ve cac ((hoc vat) or (vo van)) hanh vi cua tu*.