Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
van thanh » van tuan
hieu van » hieu va, thien van, lieu va
te sach » toc sach
van cam » van nam, van lam, van cau
cam luu » tam luu
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, ma hoa, me hoi
le cua » ly cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang ((ma hoi) or (xa hoi)). hieu van cam luu ((van thanh) OR (ban thanh)) le cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((ma hoi) OR (xa hoi)). hieu van cam luu ((van thanh) OR (ban thanh)) le cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((ma hoi) or (xa hoi)). hieu van cam luu ((van thanh) OR (ban thanh)) le cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((ma hoi) or (xa hoi)). hieu van cam luu ((van thanh) OR (ban thanh)) le cua tre*.