Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
vat hanh » vat thanh, van hanh, va hanh
ve triet » va trien, su triet
su sach » so sach, vu sach
ly nang » ky nang, ly hang, ly vang
cac hoc » cach hoc, cac hop, bac hoc
hoc vat » hoc va, hoc viet, thuc vat
y nang » ky nang, v nang, may nang
vi ve » va ve, gi ve, ve ve

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 ((y nang) OR (ly nang)) xa hoi. hieu vien cac hoc vat hanh vi ve triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (ly nang)) xa hoi. hieu vien cac hoc vat hanh vi ve triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) OR (ly nang)) xa hoi. hieu vien cac hoc vat hanh vi ve triet*.