Perhaps you should try some spelling variations:
quoc ban » quoc bao, quoc lan, quoc quan
ky tang » ky dang, kho tang, ky trong
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
xuc ban » duc ban, cuc ban, xuat ban
tu san » thu san, tu ban, tu can
ma hoi » mai hoi, xa hoi, ma hoa
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 san ((ky tang) OR (ky nang)) ma hoi. 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 san ((ky tang) OR (ky nang)) ma hoi. 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 san ((ky tang) OR (ky nang)) ma hoi. hieu va chat ((xuc ban) or (quoc ban)) hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu san ((ky tang) OR (ky nang)) ma hoi. hieu va chat ((xuc ban) or (quoc ban)) hanh vi cua te*.