Perhaps you should try some spelling variations:
thanh ha » thanh hoa, thanh hai, nhanh ha
dang cau » hang cau, bang cau, dang mau
ky dang » ky nang, ky danh
hieu va » lieu va, hieu qua
loc va » hoc va
ha cua » hoa cua, hai cua, nha cua
va ban » van ban, va bai
luc va » duc va, tuc va
va bao » va bai
cua te » cua tu

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: ((va ban) OR (va bao)) ky dang cau hoi. hieu va cac ((luc va) OR (loc va)) thanh ha cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((va ban) OR (va bao)) ky dang cau hoi. hieu va cac ((luc va) or (loc va)) thanh ha cua te~".
• Adding a wildcard symbol may retrieve word variants: ((va ban) OR (va bao)) ky dang cau hoi. hieu va cac ((luc va) or (loc va)) thanh ha cua te*.