Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
cua triet » cua viet, su triet, va triet
sach thu » sach thue, sach thieu, sach tham
thu bang » thu ban, thu hang, chu bang
cua tre » cua te, cuu tre, dua tren
tu sach » thu sach, su sach, te sach
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
bang xa » lang xa, bang va, mang xa
tuc va » thuc va, truc va, tuc xa
xuc va » duc va, luc va, xac 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 thu bang xa hoi. hieu vu cham ((xuc va) OR (tuc va)) doanh van ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu bang xa hoi. hieu vu cham ((xuc va) OR (tuc va)) doanh van ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu bang xa hoi. hieu vu cham ((xuc va) OR (tuc va)) doanh van ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach thu bang xa hoi. hieu vu cham ((xuc va) OR (tuc va)) doanh van ((cua tre) or (cua triet))*.