Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
dua tren » dung tren
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
nam xuc » cam xuc, nam xua, nam duoc
va hanh » van hanh, va thanh, va danh
vi dua » vi du, vi dum, vi lua

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 tang xa hoi. hieu van ((nam xuc) OR (nam thuc)) va hanh vi dua tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky tang xa hoi. hieu van ((nam xuc) OR (nam thuc)) va hanh vi dua tren".
• Adding a wildcard symbol may retrieve word variants: su sach ky tang xa hoi. hieu van ((nam xuc) OR (nam thuc)) va hanh vi dua tren*.