Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
qua cau » quan cau, qua cac, qua ca
van cua » vang cua, ban cua, dan cua
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
cua te » cua tu

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) OR (su sach)) ky nang x ho. hieu qua cau ((luc va) or (tuc va)) doanh van cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang x ho. hieu qua cau ((luc va) OR (tuc va)) doanh van cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang x ho. hieu qua cau ((luc va) or (tuc va)) doanh van cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky nang x ho. hieu qua cau ((luc va) or (tuc va)) doanh van cua te*.