Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach lo » sach dao, sach doi, sach hoi
lo sang » lam sang, luc sang, cao sang
sang ma » tang ma, nang ma, sang tao
hieu va » lieu va, hieu qua
va hanh » va thanh, va danh, ban hanh
ma hoi » mai hoi, xa hoi, ma hoa
de cua » le cua, te cua, dieu cua

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: tu sach lo sang ma hoi. ((hieu van) OR (hieu va)) nam thu ((va hanh) OR (van hanh)) de cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach lo sang ma hoi. ((hieu van) or (hieu va)) nam thu ((va hanh) OR (van hanh)) de cua vat~".
• Adding a wildcard symbol may retrieve word variants: tu sach lo sang ma hoi. ((hieu van) or (hieu va)) nam thu ((va hanh) OR (van hanh)) de cua vat*.