Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
nam thuc » nam thuoc, nam thu, nam tu
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
dan vai » dan va, dan tai, dan vat
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky lang xa hoi. hieu va ((nam thuc) or (am thuc)) cac dan vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky lang xa hoi. hieu va ((nam thuc) OR (am thuc)) cac dan vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach ky lang xa hoi. hieu va ((nam thuc) or (am thuc)) cac dan vai cuu tre*.