Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
thanh di » thanh doi, thanh de, thanh do
va thanh » gia thanh, ban thanh, va tinh
thuc va » thuc vat, thuc dan, thuc day
cham ky » pham ky, cam ky
tu cham » toc cham, thi cham
mai hoi » mai khoi, dai hoi, lai hoi
le nam » ly nam, he nam, le na
ma hoi » xa hoi, ma hoa, me hoi
di cau » da cau, diem cau
ve nam » he nam, va nam, te nam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu cham ky nang ((ma hoi) OR (mai hoi)). hieu ((ve nam) OR (le nam)) thuc va thanh di cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cham ky nang ((ma hoi) or (mai hoi)). hieu ((ve nam) OR (le nam)) thuc va thanh di cau tren~".
• Adding a wildcard symbol may retrieve word variants: tu cham ky nang ((ma hoi) or (mai hoi)). hieu ((ve nam) OR (le nam)) thuc va thanh di cau tren*.