Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
cao duc » dao duc, cao suc, giao duc
va hanh » van hanh, va thanh, va danh
va cao » va cac, va co, va dao
vi cua » vai cua, di cua
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 y ((nang xa) OR (nang ma)) hoi. lieu va cao duc va hanh ((vi cua) OR (de cua)) te~.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) or (nang ma)) hoi. lieu va cao duc va hanh ((vi cua) or (de cua)) te*.