Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
nang ma » tang ma, sang ma, nang cao
qua hai » qua hoat
truc va » thuc va, thuc vat, trung va
danh vi » hanh vi, dinh vi, danh di
su can » su van, su cao, tu can
can ky » van ky, dan ky, ban ky
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, tuc va, luc va
vi cau » va cau, ve cau, di cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su can ky nang ma hoi. hieu qua hai ((xuc va) or (truc va)) danh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su can ky nang ma hoi. hieu qua hai ((xuc va) OR (truc va)) danh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: su can ky nang ma hoi. hieu qua hai ((xuc va) or (truc va)) danh vi cau tren*.