Perhaps you should try some spelling variations:
doanh thu » doanh tai
vu sach » vu bach, vu khach
thu cua » thuc cua, hu cua, tu cua
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
su sach » so sach
ve cac » va cac, vien cac
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: ((vu sach) OR (su sach)) ty lang xa hoi. hieu ve cac ((tuc va) or (duc va)) doanh thu cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ty lang xa hoi. hieu ve cac ((tuc va) OR (duc va)) doanh thu cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (su sach)) ty lang xa hoi. hieu ve cac ((tuc va) or (duc va)) doanh thu cua te".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (su sach)) ty lang xa hoi. hieu ve cac ((tuc va) or (duc va)) doanh thu cua te*.