Perhaps you should try some spelling variations:
cua triet » su triet, va triet
lieu van » lieu va, hieu van, sieu van
nam truc » nam truoc, nam thuc, nam trung
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
y nang » ly nang, v nang, may nang
ho hai » hoc hai, pho hai, cho hai

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 ((y nang) or (ky nang)) ho hai. lieu van nam truc va hanh vi ((cua triet) OR (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ky nang)) ho hai. lieu van nam truc va hanh vi ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) or (ky nang)) ho hai. lieu van nam truc va hanh vi ((cua triet) OR (cua viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (ky nang)) ho hai. lieu van nam truc va hanh vi ((cua triet) OR (cua viet))*.