Perhaps you should try some spelling variations:
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
van cham » van chat, van tham, va cham
thuc van » thuc vat, thuc dan, thuc hanh
dinh dau » dinh dat, dinh du, danh dau
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
thuc va » thuc vat, thuc dan, thuc day
dau cua » dai cua, day cua, cau cua
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang xa hoi. thien van cham ((thuc van) or (thuc va)) dinh dau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. thien van cham ((thuc van) OR (thuc va)) dinh dau cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. thien van cham ((thuc van) or (thuc va)) dinh dau cua tre*.