Perhaps you should try some spelling variations:
cua triet » su triet, va triet
nham thuc » nhan thuc, nam thuc, nham thu
cua viet » ca viet, hoa viet, cua vat
vanh dai » van dai, lanh dao, van dao
vanh tai » van tai, hanh tai, anh tai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
va nham » va cham, va tham, va nha
hieu va » lieu va, hieu qua
danh xa » danh ca, dinh xa, canh xa
ky danh » ky anh, ky dang

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 ky danh xa hoi. hieu va nham thuc va ((vanh dai) or (vanh tai)) ((cua triet) OR (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky danh xa hoi. hieu va nham thuc va ((vanh dai) OR (vanh tai)) ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky danh xa hoi. hieu va nham thuc va ((vanh dai) or (vanh tai)) ((cua triet) OR (cua viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky danh xa hoi. hieu va nham thuc va ((vanh dai) or (vanh tai)) ((cua triet) OR (cua viet))*.