Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
mai hoi » mai khoi, dai hoi, lai hoi
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
ly nang » ky nang, ly hang, ly vang
nam ly » nam lay, tam ly, nam lo
ve cam » ve cham, ve cac, va cam
ma hoi » xa hoi, ma hoa, me hoi
tuc va » truc va, tuc xa, duc va
vi cau » va cau, ve cau, di cau
tu nam » su 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 nam ly nang ((ma hoi) OR (mai hoi)). hieu ve cam ((tuc va) OR (thuc va)) hanh vi cau tren~.
• Adding a wildcard symbol may retrieve word variants: tu nam ly nang ((ma hoi) or (mai hoi)). hieu ve cam ((tuc va) or (thuc va)) hanh vi cau tren*.