Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
cham hoc » cham soc, chat hoc, cham hoi
su sach » so sach, vu sach
va cham » va chat, va tham
cua tre » cuu tre, cua triet, dua tren
hoc ban » hoc bang, hoc dan, hoc bai
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
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: su sach ty ((nang ma) or (nang x)) hoi. hieu va cham hoc ban thanh dai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang ma) OR (nang x)) hoi. hieu va cham hoc ban thanh dai ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang ma) or (nang x)) hoi. hieu va cham hoc ban thanh dai ((cua tre) or (cua te))*.