Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
doanh van » doan van, doanh va, doanh ban
thu sach » tu sach, thuat sach, thu hoach
va doanh » van doanh, vay doanh, va danh
hieu van » thien van, lieu va, hieu ve
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cau duc » cao duc, cau luc, chu duc
van cua » vang cua, ban cua, dan cua
o lang » hoa lang, hoi lang
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: ((thu sach) OR (thuoc sach)) o lang xa hoi. ((hieu van) or (hieu va)) cau duc va doanh van cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) o lang xa hoi. ((hieu van) OR (hieu va)) cau duc va doanh van cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuoc sach)) o lang xa hoi. ((hieu van) or (hieu va)) cau duc va doanh van cua te*".