Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
qua cham » qua hai, qua cac, va cham
thanh ve » hanh ve, thanh va, thanh vien
thanh vi » hanh vi, thanh va, nhanh vi
cham tuc » nham thuc, pham thuc, tham thuc
lang van » dang van, tang van, hoang van
hoc sach » hoc sinh, hoc cac, hoc anh
tuc van » thuc van, truc van, tuc va
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) OR (hoc sach)) _ lang van hoa. hieu qua cham tuc van ((thanh vi) or (thanh ve)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) _ lang van hoa. hieu qua cham tuc van ((thanh vi) OR (thanh ve)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) _ lang van hoa. hieu qua cham tuc van ((thanh vi) or (thanh ve)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) _ lang van hoa. hieu qua cham tuc van ((thanh vi) or (thanh ve)) cua tre*.