Perhaps you should try some spelling variations:
hoc viet » hoc hien
cham xuc » cam xuc, chat xuc, cham soc
lang van » dang van, tang van, hoang van
sach ky » sac ky, sach ty, sach kem
va hanh » van hanh, va thanh, va danh
va cham » va chat, va tham
hieu va » lieu va, hieu qua
xuc va » duc va, tuc va, luc va

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 ky) or (sach y)) lang van hoa. hieu va cham xuc va hanh vi ((so viet) OR (hoc viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) lang van hoa. hieu va cham xuc va hanh vi ((so viet) OR (hoc viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sach y)) lang van hoa. hieu va cham xuc va hanh vi ((so viet) OR (hoc viet))".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach y)) lang van hoa. hieu va cham xuc va hanh vi ((so viet) OR (hoc viet))*.