Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
va dinh » van dinh, va kinh, va tinh
va danh » va dan, va hanh, dia danh
hieu va » lieu va, hieu qua
cac dac » cac dan, cac dai, cac bac
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
ca cua » co cua
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 ((nang xa) or (nang ma)) hoi. hieu va cac dac ((va danh) or (va dinh)) ca cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (nang ma)) hoi. hieu va cac dac ((va danh) OR (va dinh)) ca cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) or (nang ma)) hoi. hieu va cac dac ((va danh) or (va dinh)) ca cua te*.