Perhaps you should try some spelling variations:
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tang ma » mang may, tang van
qua hai » qua hoat
hai xuc » hai cuc, hai xu, chat xuc
xuc ban » duc ban, cuc ban, quoc ban
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach tu ((nang x) or (tang ma)) hoi. hieu qua hai xuc ban hanh vi ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu ((nang x) OR (tang ma)) hoi. hieu qua hai xuc ban hanh vi ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: tu sach tu ((nang x) or (tang ma)) hoi. hieu qua hai xuc ban hanh vi ((cua te) or (cua tu))*.