Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hieu viec » nhieu viec, hieu ve, sieu viet
vat hanh » vat thanh, van hanh, va hanh
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
cac hoc » cach hoc, cac hop, bac hoc
hoc vat » hoc va, hoc viet, thuc vat
y nang » ky nang, ly nang, v nang
vi su » va su, ve su, ki su

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 xa hoi. ((hieu hien) or (hieu viec)) cac hoc vat hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. ((hieu hien) OR (hieu viec)) cac hoc vat hanh vi su triet.
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. ((hieu hien) or (hieu viec)) cac hoc vat hanh vi su triet*.