Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
gia doanh » gia thanh, gia dinh, giai doan
su triet » su viet, su tien, ve triet
cam duc » cam xuc, cao duc, pham duc
duc gia » quoc gia
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ly vang » ly hang, ly quang
ly van » le van, ly va, ly von
ve cam » ve cham, ve cac, va cam

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 ((ly vang) or (ly van)) xa hoi. hieu ve cam duc gia doanh tai ((cua triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly vang) OR (ly van)) xa hoi. hieu ve cam duc gia doanh tai ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ly vang) or (ly van)) xa hoi. hieu ve cam duc gia doanh tai ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly vang) or (ly van)) xa hoi. hieu ve cam duc gia doanh tai ((cua triet) OR (su triet))*.