Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
va danh » va dinh, va dan, dia danh
lang xa » lang ha, dang xay, lang van
va hanh » van hanh, va thanh, ban hanh
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
va cua » va chua, via cua, ca cua
ve cac » va cac, vien cac
cua te » cua tu

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 ((lang xa) or (nang x)) hoi. hieu ve cac duc ((va danh) or (va hanh)) va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((lang xa) OR (nang x)) hoi. hieu ve cac duc ((va danh) OR (va hanh)) va cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((lang xa) or (nang x)) hoi. hieu ve cac duc ((va danh) or (va hanh)) va cua te*.