Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
bach xuc » bach tuoc, bach xuan, bach hue
thanh va » thanh van, thanh ha, thanh ve
cao tang » cao dang
hanh va » hang va, hanh vi
xuc gia » duc gia, luc gia, tuc gia
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet

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 ((kho tang) or (cao tang)) xa hoi. hieu vien bach xuc gia ((thanh va) OR (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((kho tang) OR (cao tang)) xa hoi. hieu vien bach xuc gia ((thanh va) OR (hanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((kho tang) or (cao tang)) xa hoi. hieu vien bach xuc gia ((thanh va) OR (hanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((kho tang) or (cao tang)) xa hoi. hieu vien bach xuc gia ((thanh va) OR (hanh va)) cua tre*.