Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
sang ma » tang ma, nang ma, sang tao
van cam » van nam, van lam, van cau
va hanh » van hanh, va thanh, va danh
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.

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