Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
su sach » vu sach
cua tre » cua te, cua triet, dua tren
thu van » thuc van, thuy van, tu van
cac thu » cach thuc, cac thoi
van cac » van hac, van cau, van bac
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang
so sach » so sanh, bo sach, co sach
cuu tre » cau tren, cau treo

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) or (so sach)) ly nang xa hoi. hieu van cac thu van hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ly nang xa hoi. hieu van cac thu van hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ly nang xa hoi. hieu van cac thu van hanh vi ((cua tre) or (cuu tre))*.