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