Perhaps you should try some spelling variations:
hien bien » dien bien, khien dien, hien nhien
bien cac » vien cac, dien cac, bien ca
su triet » su tien, ve triet
va hanh » van hanh, va thanh, va danh
cac xuc » cam xuc, cac nuoc, chat xuc
tu sach » thu sach, su sach, te sach
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
su viet » so viet
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: tu sach ((ky lang) OR (ky tang)) xa hoi. hien bien cac xuc va hanh vi ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky tang)) xa hoi. hien bien cac xuc va hanh vi ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky lang) OR (ky tang)) xa hoi. hien bien cac xuc va hanh vi ((su triet) or (su viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) OR (ky tang)) xa hoi. hien bien cac xuc va hanh vi ((su triet) or (su viet))*.