Perhaps you should try some spelling variations:
chai thoi » chi thoi, chuoi thoi, chat thai
chai hoi » cham hoi, chai khoa, cau hoi
ky lang » ky nang, ky dang, ky tang
dua ban » dia ban, cua ban, qua ban
duc ban » duc tan, duc van, duc man
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky lang ((chai hoi) or (chai thoi)). hieu va chat ((duc ban) OR (dua ban)) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky lang ((chai hoi) OR (chai thoi)). hieu va chat ((duc ban) OR (dua ban)) hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky lang ((chai hoi) or (chai thoi)). hieu va chat ((duc ban) OR (dua ban)) hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu cac ky lang ((chai hoi) or (chai thoi)). hieu va chat ((duc ban) OR (dua ban)) hanh vi cua te*.