Perhaps you should try some spelling variations:
cua tre » cua te, cuu tre, cua triet
cac tac » cac toc, cac bac, cac dac
su sach » so sach, vu sach
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
cac tuc » cac toc, cac tu, cac nuoc
vi cua » vai cua, di cua
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu bach) or (su sach)) ky lang ha hoi. hieu ve ((cac tuc) or (cac tac)) va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu bach) OR (su sach)) ky lang ha hoi. hieu ve ((cac tuc) OR (cac tac)) va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu bach) or (su sach)) ky lang ha hoi. hieu ve ((cac tuc) or (cac tac)) va hanh vi cua tre*.