Perhaps you should try some spelling variations:
thien van » thi van
cau tren » cu tren, dau tren, ca tren
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
cam thuc » am thuc, nam thuc, cam thu
thuc va » thuc vat, thuc dan, thuc day
mai hoi » mai khoi, lai hoi, mai doi
dai hoi » dai hoc, dai hai, dai moi
hieu ve » hieu va, hieu van
vi cau » va cau, ve cau, di cau
tu cam » tu cham, tu cac, tu nam
cam ky » cao ky, cac ky

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 cam ky nang ((mai hoi) OR (dai hoi)). ((hieu ve) OR (thien van)) cam thuc va thanh vi cau tren~.
• Adding a wildcard symbol may retrieve word variants: tu cam ky nang ((mai hoi) or (dai hoi)). ((hieu ve) or (thien van)) cam thuc va thanh vi cau tren*.