Perhaps you should try some spelling variations:
quoc ban » quoc bao, quoc lan, quoc quan
mai khoi » mai khoa, tai khoa, cac khoi
hieu va » lieu va, hieu qua
mai hoi » dai hoi, lai hoi, mai doi
ky lang » ky nang, ky dang, ky tang
va chat » van chat, va phat, cao chat
xuc ban » duc ban, cuc ban, xuat ban
vi cua » vai cua, di cua
tu van » tu va
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 van ky lang ((mai hoi) OR (mai khoi)). hieu va chat ((xuc ban) or (quoc ban)) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu van ky lang ((mai hoi) OR (mai khoi)). hieu va chat ((xuc ban) OR (quoc ban)) hanh vi cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu van ky lang ((mai hoi) OR (mai khoi)). hieu va chat ((xuc ban) or (quoc ban)) hanh vi cua te*".