Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
va danh » va dinh, va dan, dia danh
sang ma » nang ma, sang tao, mang may
tang ma » mang may, tang van
va hanh » van hanh, va thanh, ban hanh
hieu ve » hieu va, hieu van
cac loc » cac lop, cac toc, cac hoc
di cua » dai cua, doi cua, de 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 ((sang ma) or (tang ma)) hoi. hieu ve cac loc ((va danh) OR (va hanh)) di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((sang ma) OR (tang ma)) hoi. hieu ve cac loc ((va danh) OR (va hanh)) di cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((sang ma) or (tang ma)) hoi. hieu ve cac loc ((va danh) OR (va hanh)) di cua te*".