Perhaps you should try some spelling variations:
hoc sach » hoc cac, hoc anh
cham tuc » nham thuc, pham thuc, tham thuc
van dinh » van minh, van dich, va dinh
dinh dau » dinh dat, dinh du, danh dau
nang xa » nang x, lang xa, nang ma
thi van » thi lan, thi hanh, thi nang
tuc van » thuc van, truc van, tuc va
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: ((hoc sach) or (hoc sinh)) ky nang xa hoi. ((thien van) or (thi van)) cham tuc van dinh dau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc sinh)) ky nang xa hoi. ((thien van) OR (thi van)) cham tuc van dinh dau cua tre.
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (hoc sinh)) ky nang xa hoi. ((thien van) or (thi van)) cham tuc van dinh dau cua tre*.