Perhaps you should try some spelling variations:
truong doi » truong dai, trong doi, truong hoi
sach thu » sach thue, sach thieu, sach tham
nam thuc » nam thuoc, am thuc, nam thu
thuc cac » thuc cach, tuc cac, phuc cac
sach ty » sach y, sach tu, xach tay
hieu va » lieu va, hieu qua
cua tre » cuu tre, cua triet, dua tren
va nam » van nam, ha nam, va nay
cua te » cua tu

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 nam thuc cac truong doi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co ((sach ty) OR (sach thu)) nang x ho. hieu va nam thuc cac truong doi ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: co ((sach ty) or (sach thu)) nang x ho. hieu va nam thuc cac truong doi ((cua tre) or (cua te))*.