Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
ban hanh » ban hang
su sach » so sach, vu sach
tang ma » mang may, tang van
qua cai » qua hai, qua cac, qua ca
cai duc » cao duc, mai duc, hoai duc
duc ban » duc tan, duc van, dua ban
vi cua » vai cua, di cua
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: su sach y ((tang ma) or (lang van)) hoi. hieu qua cai duc ban hanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((tang ma) OR (lang van)) hoi. hieu qua cai duc ban hanh vi cua tu*.