Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh dai » thanh hai, thanh tai, thanh dat
dang xay » dang van, van xay
te sach » toc sach
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac cuc » cac cuoc, cac cua, cac nuoc
cuc ban » cua ban, cac ban, cuu ban
cua te » cua tu

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

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