Perhaps you should try some spelling variations:
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
mang xa » lang xa, mang may, dang xay
cac duc » cac du, cao duc, cac dac
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
ca cua » co cua
va dan » ca dan, va dao, va dau
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) OR (su sach)) ky ((mang xa) or (nang ma)) hoi. hieu va cac duc va dan ca cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky ((mang xa) OR (nang ma)) hoi. hieu va cac duc va dan ca cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky ((mang xa) or (nang ma)) hoi. hieu va cac duc va dan ca cua te*".