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
van cam » van nam, van lam, van cau
cuu tre » cua tre, cau tren, cau treo
lang xa » lang ha, dang xay, lang van
cam tu » cam thu, nam tu, dam tu
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 ((lang xa) or (nang x)) hoi. hieu van cam tu va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (hoc sach)) ky ((lang xa) OR (nang x)) hoi. hieu van cam tu va hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (hoc sach)) ky ((lang xa) or (nang x)) hoi. hieu van cam tu va hanh vi cuu tre*.