Perhaps you should try some spelling variations:
dien cua » dieu cua, dien cuc, dien cu
vien cua » viec cua, tien cua, bien cua
thu sac » thu sach, thu san, thu xac
cao duc » dao duc, cao suc, giao duc
va phan » van phan, va phat, va phap
hieu va » lieu va, hieu qua
hieu ve » hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky lang xa hoi. ((hieu ve) OR (hieu va)) cao duc va phan ((vien cua) OR (dien cua)) tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky lang xa hoi. ((hieu ve) OR (hieu va)) cao duc va phan ((vien cua) or (dien cua)) tu~".
• Adding a wildcard symbol may retrieve word variants: thu sac ky lang xa hoi. ((hieu ve) OR (hieu va)) cao duc va phan ((vien cua) or (dien cua)) tu*.