Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cau treo » cau theo, cau tren, cau triet
thanh de » hanh de, thanh ve, thanh do
toc sach » hoc sach, doc sach, thuoc sach
ve cham » va cham, ve chat, vu cham
ly nang » ky nang, ly hang, ly vang
ve cam » ve cac, va cam, ve cai
nang o » nang co, nang ho, nang ro
de cau » ke cau, le cau, ve cau
o hai » co hai, so hai, o lai

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) OR (toc sach)) ly nang o hai. hieu ((ve cam) or (ve cham)) cua ban thanh de cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ly nang o hai. hieu ((ve cam) OR (ve cham)) cua ban thanh de cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ly nang o hai. hieu ((ve cam) or (ve cham)) cua ban thanh de cau treo".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ly nang o hai. hieu ((ve cam) or (ve cham)) cua ban thanh de cau treo*.