Perhaps you should try some spelling variations:
thien van » thi van
cua triet » cua viet, su triet, va triet
dao cua » dai cua, day cua, dan cua
va lanh » va lang, va danh, va hanh
cam tuc » cam xuc, cam tu, nam thuc
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
dai hoi » dai hoc, dai hai, dai moi
ty nang » ky nang, ty hang, ly nang
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: tu sach ((ty nang) or (ty xang)) dai hoi. ((hieu ve) or (thien van)) cam tuc va lanh dao cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty xang)) dai hoi. ((hieu ve) OR (thien van)) cam tuc va lanh dao cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ty xang)) dai hoi. ((hieu ve) or (thien van)) cam tuc va lanh dao cua triet*.