Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh da » thanh dat, thanh dam, thanh dan
dang xay » dang van, van xay
hieu va » lieu va, hieu qua
tuc ban » thuc ban, truc ban, tu ban
cam tuc » cam xuc, cam tu, nam thuc
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
nang xa » nang x, lang xa, nang ma
su viet » so viet
va cam » va cham, va cac, va cao
da su » dan su, dat su, va su

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

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