Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
bo sach » co sach, hoc sach
sach ly » sach y, sach lo, sach ty
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
van hai » van chat, van phan
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang
tu van » tu va
van ha » van hoa, van chat, van phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ly nang xa hoi. thien ((van hai) or (van ha)) tu van hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ly nang xa hoi. thien ((van hai) OR (van ha)) tu van hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: bo sach ly nang xa hoi. thien ((van hai) or (van ha)) tu van hanh vi ((cua tre) or (cuu tre))*.