Perhaps you should try some spelling variations:
doanh ban » doanh bat, doanh van, doanh nhan
ty trong » ly trong, ky trong, y trong
trong xa » trong xay, trong ca, trong xu
tu sach » thu sach, su sach, te sach
hanh va » hang va, hanh vi
cuu tre » cua tre, cau tren, cau treo
sach ty » sach y, sach tu, sach thu
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
tuc va » thuc va, truc va, tuc xa
luc va » duc 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: tu sach ty trong xa hoi. hieu vu cham ((luc va) OR (tuc va)) ((hanh va) or (doanh ban)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty trong xa hoi. hieu vu cham ((luc va) OR (tuc va)) ((hanh va) OR (doanh ban)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty trong xa hoi. hieu vu cham ((luc va) OR (tuc va)) ((hanh va) or (doanh ban)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty trong xa hoi. hieu vu cham ((luc va) OR (tuc va)) ((hanh va) or (doanh ban)) cuu tre*.