Perhaps you should try some spelling variations:
chieu trien » chieu chien, hieu tren, hieu triet
trien dich » mien dich
hoc sach » hoc sinh, hoc cac, hoc anh
ty lang » tay lang, ty hang, tu lang
ngoc va » nuoc va, goc va, ngo va
ngoc ha » ngoc hai, ngoc hoa
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((ty lang) or (ty xang)) xa hoi. chieu trien dich ((ngoc va) OR (ngoc ha)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((ty lang) OR (ty xang)) xa hoi. chieu trien dich ((ngoc va) OR (ngoc ha)) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((ty lang) or (ty xang)) xa hoi. chieu trien dich ((ngoc va) OR (ngoc ha)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((ty lang) or (ty xang)) xa hoi. chieu trien dich ((ngoc va) OR (ngoc ha)) hanh vi cua tre*.