Perhaps you should try some spelling variations:
dinh viet » ninh viet, danh viet, trinh viet
cua triet » cua viet, su triet, va triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
dinh vi » dinh ve, dinh tri, dinh thi
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa

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. hieu va cac ((duc va) or (tuc va)) ((dinh vi) OR (dinh viet)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoi. hieu va cac ((duc va) OR (tuc va)) ((dinh vi) OR (dinh viet)) cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ma hoi. hieu va cac ((duc va) or (tuc va)) ((dinh vi) OR (dinh viet)) cua triet*".