Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
thu sach » tu sach, thuat sach, thuoc sach
su triet » su viet, su tien
dua tren » dung tren
dinh vai » dinh van, dinh vi, dinh va
ve triet » va trien
bach lo » sach lo, bach hoa, bach mao
va dinh » van dinh, va kinh, va tinh
sach ky » sac ky, sach y, sach ty
lo va » lo van, lao va, ly va
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang x hoi. hieu vien bach lo va dinh vai ((dua tren) or (((su triet) OR (ve triet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. hieu vien bach lo va dinh vai ((dua tren) OR (((su triet) OR (ve triet)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. hieu vien bach lo va dinh vai ((dua tren) or (((su triet) OR (ve triet))))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu vien bach lo va dinh vai ((dua tren) or (((su triet) OR (ve triet))))*.