Perhaps you should try some spelling variations:
truong doi » truong dai, trong doi, truong hoi
sach thu » sach thue, sach thieu, sach tham
sach ty » sach y, sach tu, xach tay
hieu va » hieu qua
cam tuc » cam xuc, cam tu, nam thuc
tuc cac » tu cac, tich cac
doi cua » dai cua, hoi 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: co ((sach ty) or (sach thu)) nang x ho. ((hieu va) OR (lieu va)) cam tuc cac truong doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co ((sach ty) OR (sach thu)) nang x ho. ((hieu va) OR (lieu va)) cam tuc cac truong doi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co ((sach ty) or (sach thu)) nang x ho. ((hieu va) OR (lieu va)) cam tuc cac truong doi cua tre*".