Perhaps you should try some spelling variations:
quoc ban » quoc bao, quoc lan, quoc quan
nang mai » nang ma, nang tai, lang mai
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
xuc ban » duc ban, cuc ban, xuat ban
ve chat » va chat, van chat
vi cua » vai cua, di cua
can ky » van ky, ban ky, tan ky
dan ky » van ky
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 ((can ky) or (dan ky)) nang mai hoi. hieu ve chat ((xuc ban) OR (quoc ban)) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((can ky) OR (dan ky)) nang mai hoi. hieu ve chat ((xuc ban) OR (quoc ban)) hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((can ky) or (dan ky)) nang mai hoi. hieu ve chat ((xuc ban) OR (quoc ban)) hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((can ky) or (dan ky)) nang mai hoi. hieu ve chat ((xuc ban) OR (quoc ban)) hanh vi cua te*.