Perhaps you should try some spelling variations:
ban hang » ngan hang
dang xay » dang van
van hanh » van thanh, ban hanh, van anh
co sach » bo sach, cuon sach, hoc sach
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
lam loc » lam duoc, lam ngoc
vi cua » vai cua, di cua
va lam » van lam, va lap
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: co sach ty ((dang xay) or (van xay)) hoi. hieu va lam loc ((van hanh) or (ban hang)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ty ((dang xay) OR (van xay)) hoi. hieu va lam loc ((van hanh) OR (ban hang)) vi cua te.
• Adding a wildcard symbol may retrieve word variants: co sach ty ((dang xay) or (van xay)) hoi. hieu va lam loc ((van hanh) or (ban hang)) vi cua te*.