Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cua viet » hoa viet, cua vat, cua dieu
nang van » dang van, lang van, nong van
tang van » dang van, hoang van, trong van
va hanh » van hanh, va thanh, va danh
nam tuc » nam thuc, nam truc, nam tu
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ca viet » va viet, co viet, hoa viet
tuc va » thuc va, truc va, tuc xa

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 ty ((nang van) or (tang van)) hoi. hieu van nam tuc va hanh vi ((cua viet) OR (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang van) OR (tang van)) hoi. hieu van nam tuc va hanh vi ((cua viet) OR (ca viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang van) or (tang van)) hoi. hieu van nam tuc va hanh vi ((cua viet) OR (ca viet))*".