Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vu khach » vu khanh, vu khac, vay khach
kho tang » cao tang
vien cac » vien bach, vien da, gian cac
vien dai » hien dai
hanh tri » thanh tri, hanh tai, hanh trinh
tang ma » mang may, tang van
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
ma hoi » mai hoi, xa hoi, ma hoa

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 khach)) kho tang ma hoi. hieu ((vien cac) OR (vien dai)) tu va hanh tri cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu khach)) kho tang ma hoi. hieu ((vien cac) OR (vien dai)) tu va hanh tri cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu khach)) kho tang ma hoi. hieu ((vien cac) OR (vien dai)) tu va hanh tri cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu khach)) kho tang ma hoi. hieu ((vien cac) OR (vien dai)) tu va hanh tri cua triet*.