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
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua

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 (nang ma))) or (dang xay)) hoi. hieu va cam tuc va dan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty ((((nang xa) OR (nang ma))) OR (dang xay)) hoi. hieu va cam tuc va dan vi cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ty ((((nang xa) or (nang ma))) or (dang xay)) hoi. hieu va cam tuc va dan vi cua tre*.