Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
va doanh » van doanh, vay doanh, va danh
cham duc » pham duc, cham soc, pham duy
tu sach » thu sach, su sach, te sach
van cuu » van cau, van chu, van cua
hieu va » lieu va, hieu qua
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
van cu » van cau, van chu, van 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 thu nang xa hoi. ((hieu ve) OR (hieu va)) cham duc va doanh ((van cuu) or (van cu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu nang xa hoi. ((hieu ve) OR (hieu va)) cham duc va doanh ((van cuu) OR (van cu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu nang xa hoi. ((hieu ve) OR (hieu va)) cham duc va doanh ((van cuu) or (van cu)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach thu nang xa hoi. ((hieu ve) OR (hieu va)) cham duc va doanh ((van cuu) or (van cu)) tre*.