Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
van hanh » van thanh, ban hanh, van anh
duc van » duc va, duc tan, duc manh
cai duc » cao duc, mai duc, hoai duc
qua cai » qua hai, qua cac, qua ca
su sach » vu sach
tang ma » mang may, tang van
so sach » so sanh, bo sach, co sach
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) y ((tang ma) OR (lang van)) hoi. hieu qua cai duc van hanh vi cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) y ((tang ma) or (lang van)) hoi. hieu qua cai duc van hanh vi cua tu~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) y ((tang ma) or (lang van)) hoi. hieu qua cai duc van hanh vi cua tu*.