Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
bach xuc » bach tuoc, bach xuan, bach hue
cau treo » cau theo, cau tren, cau triet
gia hanh » gia thanh, giao hanh, gia anh
kho tang » cao tang
hanh va » hang va, hanh vi
xuc gia » duc gia, luc gia, tuc gia
tu sach » thu sach, su sach, te sach
ky tang » ky nang, ky dang, ky trong
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 ((ky tang) OR (kho tang)) xa hoi. hieu vien bach xuc gia hanh va ((cau treo) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky tang) OR (kho tang)) xa hoi. hieu vien bach xuc gia hanh va ((cau treo) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky tang) OR (kho tang)) xa hoi. hieu vien bach xuc gia hanh va ((cau treo) or (cua tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky tang) OR (kho tang)) xa hoi. hieu vien bach xuc gia hanh va ((cau treo) or (cua tre))*.