Perhaps you should try some spelling variations:
dang xay » dang van, van xay
cam tuc » cam xuc, cam tu, nam thuc
hieu va » hieu qua
sach ty » sach y, sach tu, sach thu
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo
dai va » mai va
va cuu » va cau, va chu, va huu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty ((nang xa) or (dang xay)) hoi. ((hieu va) or (lieu va)) cam tuc xa dai va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty ((nang xa) OR (dang xay)) hoi. ((hieu va) OR (lieu va)) cam tuc xa dai va cuu tre.
• Adding a wildcard symbol may retrieve word variants: so sach ty ((nang xa) or (dang xay)) hoi. ((hieu va) or (lieu va)) cam tuc xa dai va cuu tre*.