Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
duc giai » duc gia, duc giao, nuoc giai
doan tri » doan thi, doanh tai, doan truc
su sach » so sach
vu sach » vu bach, vu khach
ly mang » ly hang, ly vang, ly nang
mang xa » lang xa, mang may, dang xay
hieu va » hieu qua
cac duc » cac du, cao duc, cac dac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu sach)) ly mang xa hoi. ((hieu va) or (lieu va)) cac duc giai doan tri cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ly mang xa hoi. ((hieu va) OR (lieu va)) cac duc giai doan tri cua triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ly mang xa hoi. ((hieu va) or (lieu va)) cac duc giai doan tri cua triet*.