Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
tu sach » thu sach, su sach, te sach
ky lang » ky dang, ky tang, tay lang
cac xuc » cam xuc, chat xuc, cac cuoc
va danh » va dinh, va dan, va hanh
danh ca » dan ca, doanh cua, danh cho
cua tre » cua te, cuu tre, cua triet
ca cua » co cua

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 lang) or (ky nang)) xa hoi. hieu vien ((cac xuc) OR (cac nuoc)) va danh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky nang)) xa hoi. hieu vien ((cac xuc) OR (cac nuoc)) va danh ca cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky lang) or (ky nang)) xa hoi. hieu vien ((cac xuc) OR (cac nuoc)) va danh ca cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) or (ky nang)) xa hoi. hieu vien ((cac xuc) OR (cac nuoc)) va danh ca cua tre*.