Perhaps you should try some spelling variations:
doanh va » doan va, doanh tai, doanh cua
va doanh » van doanh, vay doanh, va danh
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, ve chim
vu cham » va cham, vu kham, tu cham
cua tre » cua te, cuu tre, cua triet
y lang » _ lang, tay lang, yen lang
o lang » hoa lang, hoi lang
luc va » duc va, tuc va, loc va
va cua » va chua, via cua, ca cua

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 ((y lang) OR (o lang)) xa hoi. hieu ((ve cham) or (vu cham)) luc va doanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y lang) OR (o lang)) xa hoi. hieu ((ve cham) OR (vu cham)) luc va doanh va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y lang) OR (o lang)) xa hoi. hieu ((ve cham) or (vu cham)) luc va doanh va cua tre*".