Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dinh vi » dinh ve, dinh viet, dinh tri
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
tuc va » thuc va, truc va, tuc xa
ma hoi » xa hoi, ma hoa, me hoi
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: su sach ky nang ((ma hoi) OR (mai hoi)). hieu va cac ((duc va) or (tuc va)) dinh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((ma hoi) OR (mai hoi)). hieu va cac ((duc va) OR (tuc va)) dinh vi cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((ma hoi) OR (mai hoi)). hieu va cac ((duc va) or (tuc va)) dinh vi cua triet*".