Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
su sach » so sach, vu sach
su cham » su pham, tu cham, vu cham
chua te » chua tu, chua xe, chuan ted
tinh va » tich va, trinh van, trinh vat
va tinh » may tinh
hieu su » hieu sau, tieu su, hieu so
sach tu » sach thu, cach tu, sach ty
lang xa » lang ha, dang xay, lang van
nang ma » tang ma, sang ma, nang cao
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: su sach tu ((nang ma) or (lang xa)) hoi. hieu su cham duc va tinh va ((chua te) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu ((nang ma) OR (lang xa)) hoi. hieu su cham duc va tinh va ((chua te) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tu ((nang ma) or (lang xa)) hoi. hieu su cham duc va tinh va ((chua te) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: su sach tu ((nang ma) or (lang xa)) hoi. hieu su cham duc va tinh va ((chua te) OR (cua te))*.