Perhaps you should try some spelling variations:
hieu vu » hieu va, hieu ve, hieu su
duc van » duc va, duc tan, duc manh
luc van » luoc van, luu van, luc va
vu cham » va cham, vu kham, tu cham
cua tre » cua te, cuu tre, cua triet
lang ha » long ha
lang xa » dang xay, lang van
sai ky » sac ky
vi cua » vai cua, di cua
te sai » te tai, te bai, te lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sai ky ((lang xa) OR (lang ha)) hoi. hieu vu cham ((luc van) or (duc van)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky ((lang xa) OR (lang ha)) hoi. hieu vu cham ((luc van) OR (duc van)) hanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sai ky ((lang xa) OR (lang ha)) hoi. hieu vu cham ((luc van) or (duc van)) hanh vi cua tre*".