Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » thien van, lieu va, hieu ve
cua viet » ca viet, hoa viet, cua vat
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
xuc va » duc va, tuc va, luc va
ve cua » le cua, de cua, te cua

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 ky nang x ho. ((hieu van) or (hieu va)) cam xuc va hanh ve cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang x ho. ((hieu van) OR (hieu va)) cam xuc va hanh ve cua viet.
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang x ho. ((hieu van) or (hieu va)) cam xuc va hanh ve cua viet*.