Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
cua tre » cua te, cuu tre, cua triet
luc 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 ky nang xa hoi. hieu vu cham ((luc va) or (duc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu vu cham ((luc va) OR (duc va)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu vu cham ((luc va) or (duc va)) hanh vi cua tre*.