Perhaps you should try some spelling variations:
quoc ban » quoc bao, quoc lan, quoc quan
thu sai » thu hai, thu tai, thu san
hieu va » hieu qua
xuc ban » duc ban, cuc ban, xuat ban
banh di » danh di, xanh di, banh chi
cua tre » cua te, cuu tre, cua triet
sai ky » sac ky
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sai ky nang x hoi. ((hieu va) or (lieu va)) cam ((xuc ban) OR (quoc ban)) banh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sai ky nang x hoi. ((hieu va) OR (lieu va)) cam ((xuc ban) OR (quoc ban)) banh di cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sai ky nang x hoi. ((hieu va) or (lieu va)) cam ((xuc ban) OR (quoc ban)) banh di cua tre*".