Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
dinh lai » dinh lam, dinh lap, dinh tai
ty hang » ly hang, thi hang, thu hang
van cam » van nam, van lam, van cau
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cuu tre, dua tren
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((ty xang) or (ty hang)) xa hoi. hieu van cam xuc va dinh lai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ty xang) OR (ty hang)) xa hoi. hieu van cam xuc va dinh lai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ty xang) or (ty hang)) xa hoi. hieu van cam xuc va dinh lai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ty xang) or (ty hang)) xa hoi. hieu van cam xuc va dinh lai ((cua tre) OR (cua triet))*.