Perhaps you should try some spelling variations:
ca tren » cau tren, cu tren, la tren
hanh ve » hanh vi, hanh va, hanh kem
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
mai hoi » mai khoi, dai hoi, lai hoi
va nam » van nam, ha nam, va nay
tu cam » tu cham, tu cac, tu nam
cam ky » cao ky, cac ky
ma hoi » xa hoi, ma hoa, me hoi
ve nam » he nam, le nam, te nam
ve ca » ve cac, ve cai, ve cau

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 ((ma hoi) OR (mai hoi)). hieu ((ve nam) OR (va nam)) thuc va hanh ve ca tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cam ky nang ((ma hoi) or (mai hoi)). hieu ((ve nam) OR (va nam)) thuc va hanh ve ca tren~".
• Adding a wildcard symbol may retrieve word variants: tu cam ky nang ((ma hoi) or (mai hoi)). hieu ((ve nam) OR (va nam)) thuc va hanh ve ca tren*.