Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
nam thuc » nam thuoc, am thuc, nam thu
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
cam ky » cao ky, cac ky
ve nam » he nam, va nam, le nam
ma hoi » xa hoi, me hoi, va hoi
vi cau » va cau, ve cau, di cau
tu cam » tu cham, tu cac, tu 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 cam ky nang ((((ma hoi) OR (ma hoa))) OR (mai hoi)). hieu ve nam thuc va hanh vi cau tren~.
• Adding a wildcard symbol may retrieve word variants: tu cam ky nang ((((ma hoi) or (ma hoa))) or (mai hoi)). hieu ve nam thuc va hanh vi cau tren*.