Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, dua tren
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
bao bo » bac bo, ban bo, bao bi
nao bo » nam bo
ma hoi » mai hoi, xa hoi, ma hoa

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 ma hoi. hieu va ((bao bo) or (nao bo)) va hanh va ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ma hoi. hieu va ((bao bo) OR (nao bo)) va hanh va ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ma hoi. hieu va ((bao bo) or (nao bo)) va hanh va ((cua tre) or (cua triet))*.