Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
nam thuc » nam thuoc, nam thu, nam tu
lang van » dang van, tang van, hoang van
dan vai » dan tai, dan vat, den vai
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
van hoi » van hoa, van hoc, van hoe
ky lang » ky nang, ky dang, ky tang
dan va » doan va, dan ca, ban va

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 van hoi. hieu va ((nam thuc) or (am thuc)) va ((dan vai) OR (dan va)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky lang van hoi. hieu va ((nam thuc) OR (am thuc)) va ((dan vai) OR (dan va)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky lang van hoi. hieu va ((nam thuc) or (am thuc)) va ((dan vai) OR (dan va)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky lang van hoi. hieu va ((nam thuc) or (am thuc)) va ((dan vai) OR (dan va)) cuu tre*.