Perhaps you should try some spelling variations:
kho tang » cao tang
hieu van » hieu va, thien van, lieu va
te sach » toc sach
van cam » van nam, van lam, van cau
cuu ban » cuu van, cuu san, cuu nang
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((kho tang) or (ky nang)) xa hoi. hieu van cam ((cuu ban) OR (cua ban)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((kho tang) OR (ky nang)) xa hoi. hieu van cam ((cuu ban) OR (cua ban)) hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((kho tang) or (ky nang)) xa hoi. hieu van cam ((cuu ban) OR (cua ban)) hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((kho tang) or (ky nang)) xa hoi. hieu van cam ((cuu ban) OR (cua ban)) hanh di cua tre*.