Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cua viet » hoa viet, cua vat, cua dieu
sang tao » hang tai
va hanh » van hanh, va thanh, va danh
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
ca viet » va viet, co viet, hoa viet
sang ma » tang ma, nang ma, mang may
luc va » duc va, tuc va, loc va
ve cau » ke cau, va cau, ve cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach y ((sang ma) or (sang tao)) hoi. hieu ve cau luc va hanh vi ((cua viet) OR (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y ((sang ma) OR (sang tao)) hoi. hieu ve cau luc va hanh vi ((cua viet) OR (ca viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach y ((sang ma) or (sang tao)) hoi. hieu ve cau luc va hanh vi ((cua viet) OR (ca viet))*".