Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
te sach » toc sach
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
tuc va » thuc va, truc va, tuc xa
vi cuu » vi luu, vinh cuu

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) or (hoc sach)) ky ((nang ma) or (nang x)) hoi. hieu van cam tuc va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (hoc sach)) ky ((nang ma) OR (nang x)) hoi. hieu van cam tuc va hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (hoc sach)) ky ((nang ma) or (nang x)) hoi. hieu van cam tuc va hanh vi cuu tre*.