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

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