Perhaps you should try some spelling variations:
thien van » thi van
su triet » su viet, su tien, ve triet
hanh dao » lanh dao, thanh dat, thanh dam
hieu van » hieu va, lieu va, hieu ve
ty hang » ly hang, ty xang, thi hang
mai hoi » mai khoi, dai hoi, lai hoi
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
ly nang » ky nang, ly hang, ly vang
tu sach » thu sach, su sach, te sach
dao su » dao suu, dan su, cao 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 ((ly nang) or (ty hang)) mai hoi. ((hieu van) or (thien van)) cam duc va hanh dao su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly nang) OR (ty hang)) mai hoi. ((hieu van) OR (thien van)) cam duc va hanh dao su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly nang) or (ty hang)) mai hoi. ((hieu van) or (thien van)) cam duc va hanh dao su triet*.