Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
xuc van » duc van, luc van, xuc ban
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
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 sac) or (toc sach)) ky lang xa hoi. hieu ve cham ((xuc van) or (duc tan)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (toc sach)) ky lang xa hoi. hieu ve cham ((xuc van) OR (duc tan)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (toc sach)) ky lang xa hoi. hieu ve cham ((xuc van) or (duc tan)) hanh vi cua tre*.