Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
van hanh » van thanh, ban hanh, van anh
sach cuc » sach cua, sach duoc, sach nuoc
su triet » su viet, su tien, ve triet
cuc nang » chuc nang, cuu nang, cua nang
mai hoi » dai hoi, lai hoi, mai doi
hieu va » hieu qua
xuc van » duc van, luc van, vuc van
tu sach » thu sach, su sach, te sach
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach cuc nang ((mai hoi) or (mai khoi)). ((hieu va) or (lieu va)) cam xuc van hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach cuc nang ((mai hoi) OR (mai khoi)). ((hieu va) OR (lieu va)) cam xuc van hanh vi su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach cuc nang ((mai hoi) or (mai khoi)). ((hieu va) or (lieu va)) cam xuc van hanh vi su triet*.