Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
thanh va » thanh van, hanh va, thanh ha
cam luc » cam xuc, cau luc
luc gia » luoc gia, duc gia, quoc gia
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
lang ha » long ha
va cam » va cham, va cac, va cao

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 y ((dang xay) or (lang ha)) hoi. hieu va cam luc gia ((hanh vi) or (thanh va)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y ((dang xay) OR (lang ha)) hoi. hieu va cam luc gia ((hanh vi) OR (thanh va)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y ((dang xay) or (lang ha)) hoi. hieu va cam luc gia ((hanh vi) or (thanh va)) cuu tre*.