Perhaps you should try some spelling variations:
dang xay » dang van, van xay
sach thu » sach thue, sach thieu, sach tham
sach ty » sach y, sach tu, xach tay
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo
va cam » va cham, va cac, va cao
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) OR (sach thu)) ((nang xa) or (dang xay)) hoi. hieu va cam tuc xa dan va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ty) OR (sach thu)) ((nang xa) OR (dang xay)) hoi. hieu va cam tuc xa dan va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach ty) OR (sach thu)) ((nang xa) or (dang xay)) hoi. hieu va cam tuc xa dan va cuu tre".
• Adding a wildcard symbol may retrieve word variants: so ((sach ty) OR (sach thu)) ((nang xa) or (dang xay)) hoi. hieu va cam tuc xa dan va cuu tre*.