Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
va triet » va thiet, ve triet, cua triet
hanh dai » hanh tai, hanh dao, vanh dai
tru nang » tra nang, tri nang, truc nano
co truc » co thuc, cau truc, co trach
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
te sach » toc sach
hieu va » lieu va, hieu qua
tu nong » tu dong, tu cong, tu tong
va co » vo co

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((tu nong) OR (tru nang)) xa hoi. hieu va co truc va hanh dai ((va triet) OR (va trien))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((tu nong) OR (tru nang)) xa hoi. hieu va co truc va hanh dai ((va triet) OR (va trien))".
• Adding a wildcard symbol may retrieve word variants: te sach ((tu nong) OR (tru nang)) xa hoi. hieu va co truc va hanh dai ((va triet) OR (va trien))*.