Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
hoang van » hang va
vien cac » vien bach, vien dai, vien da
luoc van » luoc can, luoc va, luc van
nang xa » nang x, lang xa, nang ma
lo van » le van, vo van, so van
vi cua » vai cua, di cua
te sac » te sach, te cac, te san
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.

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky ((nang xa) or (hoang van)) hoi. hieu vien cac ((luoc van) or (lo van)) hanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((nang xa) OR (hoang van)) hoi. hieu vien cac ((luoc van) OR (lo van)) hanh vi cua tu.
• Adding a wildcard symbol may retrieve word variants: te sac ky ((nang xa) or (hoang van)) hoi. hieu vien cac ((luoc van) or (lo van)) hanh vi cua tu*.