Perhaps you should try some spelling variations:
nang doc » nang luc
luoc van » luoc can, luoc va, luot van
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
luc van » luu van, duc van, vuc van
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
doc hoi » duoc hoi, hoc hoi, doc hai
tu nang » tru nang, tu nong, tu nano
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach tu nang doc hoi. hieu vu cham ((((luc van) or (luc va))) or (luoc van)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang doc hoi. hieu vu cham ((((luc van) OR (luc va))) OR (luoc van)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang doc hoi. hieu vu cham ((((luc van) or (luc va))) or (luoc van)) hanh vi cua tre*.