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