Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cua tre » cuu tre, cua triet, dua tren
tan anh » tuan anh, tran anh, toan anh
cao duc » dao duc, cao suc, giao duc
hieu ve » hieu va, hieu van
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
ve cao » va cao, ve bao, ve cac
anh va » hanh va
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: thuat sach y ((nang ma) OR (sang ma)) hoi. hieu ve cao duc tan anh va ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y ((nang ma) OR (sang ma)) hoi. hieu ve cao duc tan anh va ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y ((nang ma) OR (sang ma)) hoi. hieu ve cao duc tan anh va ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: thuat sach y ((nang ma) OR (sang ma)) hoi. hieu ve cao duc tan anh va ((cua tre) or (cua te))*.