Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nang dai » nang dau, lang dai, nang cai
nang tai » hang tai, tang tai, sang tai
hanh day » hanh may, han day, hanh dao
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, dua tren
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
luc va » duc va, tuc va, loc va
ve coc » ve cuoc, ve cac, ve co

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky ((nang dai) OR (nang tai)) khoa. hieu ve coc luc va hanh day ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((nang dai) OR (nang tai)) khoa. hieu ve coc luc va hanh day ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky ((nang dai) OR (nang tai)) khoa. hieu ve coc luc va hanh day ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: so sach ky ((nang dai) OR (nang tai)) khoa. hieu ve coc luc va hanh day ((cua tre) or (cua triet))*.