Perhaps you should try some spelling variations:
dang xay » dang van, van xay
so sach » so sanh, bo sach, co sach
cam tuc » cam xuc, cam tu, nam thuc
sach ty » sach y, sach tu, sach thu
hieu va » hieu qua
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo
xa dan » ca dan, xa dai, va dan
dan va » doan va, dan ca, ban 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 dan 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 dan va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty ((nang xa) or (dang xay)) hoi. ((hieu va) OR (lieu va)) cam tuc xa dan 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 dan va cuu tre*.