Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
van hang » van khang, van hoang, van thang
tu sach » thu sach, su sach, te sach
hang di » hang doi, hang vi, hang dien
tuc van » thuc van, truc van, tuc va
cam tuc » cam xuc, cam tu, nam thuc
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cua te » cua tu
ve cam » ve cham, ve cac, va cam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (hoc sach)) ky lang xa hoi. hieu ve cam tuc van hang di ((cua te) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (hoc sach)) ky lang xa hoi. hieu ve cam tuc van hang di ((cua te) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (hoc sach)) ky lang xa hoi. hieu ve cam tuc van hang di ((cua te) or (cuu tre))*.