Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
thanh via » thanh vien, thanh vinh, thanh gian
viec cac » vien cac, viec cua, viec lam
thanh va » thanh van, hanh va, thanh ha
dang xay » dang van, van xay
cac luc » cau luc, coc luc, cac nuoc
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, lang van
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky ((lang xa) OR (dang xay)) hoi. hieu viec cac luc va ((thanh via) or (thanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((lang xa) OR (dang xay)) hoi. hieu viec cac luc va ((thanh via) OR (thanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky ((lang xa) OR (dang xay)) hoi. hieu viec cac luc va ((thanh via) or (thanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((lang xa) OR (dang xay)) hoi. hieu viec cac luc va ((thanh via) or (thanh va)) cua tre*.