Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
khien ban » khien bang, phien ban, kien ban
hieu viec » nhieu viec, hieu ve, sieu viet
viec bac » viec ban, viec bao, viet bac
cho ban » co ban, cho bac, cho can
van chi » van chien, luan chi, van chat
chi tre » choi tre, cho tre, chi tro
tay hoi » tay ho, tao hoi, tay thai
xay hoi » xa hoi, cay phoi, gay thoi
ky dang » ky nang, ky danh
sac ky » cac ky, sai ky
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky dang ((xay hoi) OR (tay hoi)). hieu viec bac ((cho ban) or (khien ban)) thanh van chi tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky dang ((xay hoi) OR (tay hoi)). hieu viec bac ((cho ban) OR (khien ban)) thanh van chi tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky dang ((xay hoi) OR (tay hoi)). hieu viec bac ((cho ban) or (khien ban)) thanh van chi tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky dang ((xay hoi) OR (tay hoi)). hieu viec bac ((cho ban) or (khien ban)) thanh van chi tre*.