Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, dua tren
hanh va » hang va, hanh vi
co sach » bo sach, cuon sach, hoc sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
bao bo » bac bo, ban bo, bao bi
y nang » ky nang, ly nang, v nang
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: co sach y 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: co sach y 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: co sach y nang ma hoi. hieu va ((bao bo) or (nao bo)) va hanh va ((cua tre) or (cua triet))*.