Perhaps you should try some spelling variations:
ban thanh » ban hang
cham tuc » nham thuc, pham thuc, tham thuc
vien cuu » vien huu, vien buu, viec cua
ban hanh » ban hang
va cham » va chat, va tham
sach ty » sach y, sach tu, sach thu
nang co » nang cao, nang doc, nang noi
cuu tre » cua tre, cau tren, cau treo
co hoi » co hoc, co loi
sac ky » cac ky, sai ky

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 ty) or (sac ky)) nang co hoi. lieu va cham tuc ((ban thanh) OR (ban hanh)) vien cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sac ky)) nang co hoi. lieu va cham tuc ((ban thanh) OR (ban hanh)) vien cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sac ky)) nang co hoi. lieu va cham tuc ((ban thanh) OR (ban hanh)) vien cuu tre*".