Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach kem
hieu va » lieu va, hieu qua
nang co » nang cao, nang doc, nang noi
sach ty » sach y, sach tu, sach thu
cuu tre » cua tre, cau tren, cau treo
co hoi » co hoc, co loi
va bao » va bai
bao bo » bac bo, ban bo, nao bo
bo va » bao va, do va, so va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) or (sach ty)) nang co hoi. hieu va bao bo va hanh vi ((cua triet) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) nang co hoi. hieu va bao bo va hanh vi ((cua triet) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach ty)) nang co hoi. hieu va bao bo va hanh vi ((cua triet) or (cuu tre))*.