Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
cau tren » cu tren, dau tren, ca tren
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
danh vi » hanh vi, dinh vi, danh di
su can » su van, su cao, tu can
can ky » van ky, dan ky, ban ky
va hai » van hai, va chai, va khai
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
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 mai hoi. hieu va hai ((xuc va) or (tuc va)) danh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su can ky nang mai hoi. hieu va hai ((xuc va) OR (tuc va)) danh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: su can ky nang mai hoi. hieu va hai ((xuc va) or (tuc va)) danh vi cau tren*.