Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
bach tuoc » sach duoc, sach nuoc
bach xuc » bach xuan, bach hue, bach qua
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
va cua » va chua, via cua, ca cua
tu san » thu san, tu ban, tu can

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ((ky lang) or (ky dang)) xa hoi. hieu vien ((bach xuc) OR (bach tuoc)) va hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ((ky lang) OR (ky dang)) xa hoi. hieu vien ((bach xuc) OR (bach tuoc)) va hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ((ky lang) or (ky dang)) xa hoi. hieu vien ((bach xuc) OR (bach tuoc)) va hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: tu san ((ky lang) or (ky dang)) xa hoi. hieu vien ((bach xuc) OR (bach tuoc)) va hanh va cua tre*.