Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
dinh lam » dinh van, tinh lao
lam cua » nam cua, lam chat
va dinh » van dinh, va kinh, va tinh
cam tuc » cam xuc, cam tu, nam thuc
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
dai hoi » dai hoc, dai hai, dai moi
mai hoi » mai khoi, lai hoi, mai doi
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 ((mai hoi) or (dai hoi)). ((hieu ve) OR (hieu van)) cam tuc va dinh lam cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((mai hoi) OR (dai hoi)). ((hieu ve) OR (hieu van)) cam tuc va dinh lam cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((mai hoi) or (dai hoi)). ((hieu ve) OR (hieu van)) cam tuc va dinh lam cua triet*".