Perhaps you should try some spelling variations:
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
te sach » toc sach
sach ty » sach y, sach tu, sach thu
van hac » van hoc, van ha, van hai
sang ma » tang ma, nang ma, sang tao
ty sang » ty xang, ty hang, duy sang
va hac » va khac, va cac, va hoc
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de 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: te sach ty sang ma hoi. hieu ((va hac) OR (van hac)) duc ((van hanh) OR (ban hanh)) di cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty sang ma hoi. hieu ((va hac) OR (van hac)) duc ((van hanh) or (ban hanh)) di cua tu~".
• Adding a wildcard symbol may retrieve word variants: te sach ty sang ma hoi. hieu ((va hac) OR (van hac)) duc ((van hanh) or (ban hanh)) di cua tu*.