Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
trung va » truong va, trang va, trung ha
sach ky » sac ky, sach y, sach ty
van dac » van dau, van hac, van dan
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dao, va dau
dan di » danh di, dan da, dan de
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang x hoi. hieu ((van dac) or (van dao)) trung va dan di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. hieu ((van dac) OR (van dao)) trung va dan di cua tre*.