Perhaps you should try some spelling variations:
cham tuc » nham thuc, pham thuc, tham thuc
va thanh » ban thanh, va tinh, le thanh
cau tren » cu tren, dau tren, ca tren
te sach » toc sach
cao hoi » cau hoi, cao hoc, tao hoi
hieu va » lieu va, hieu qua
va cham » va chat, va tham
hai cau » hai chau, hai chu, hai hau
y nang » ky nang, ly nang, v nang
co hoi » co hoc, co loi

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 ((cao hoi) OR (co hoi)). hieu va cham tuc ((va thanh) or (gia thanh)) hai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((cao hoi) OR (co hoi)). hieu va cham tuc ((va thanh) OR (gia thanh)) hai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((cao hoi) OR (co hoi)). hieu va cham tuc ((va thanh) or (gia thanh)) hai cau tren".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((cao hoi) OR (co hoi)). hieu va cham tuc ((va thanh) or (gia thanh)) hai cau tren*.