Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
nam thuc » nam thuoc, am thuc, nam thu
sach thu » sach thue, sach thieu, sach tham
va triet » va thiet, va trien, ve triet
thu nang » thi nang, thu hang, thu bang
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
thuc va » thuc vat, thuc dan, thuc day
dan vai » dan va, dan vat, den vai
dan tai » van tai, dan thi, ban tai
han tai » hang tai, nhan tai, van tai
ve nam » he nam, va nam, le nam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach thu nang xa hoi. hieu ve nam thuc va ((dan vai) or (((dan tai) OR (han tai)))) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach thu nang xa hoi. hieu ve nam thuc va ((dan vai) OR (((dan tai) OR (han tai)))) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach thu nang xa hoi. hieu ve nam thuc va ((dan vai) or (((dan tai) OR (han tai)))) va triet".
• Adding a wildcard symbol may retrieve word variants: hoc sach thu nang xa hoi. hieu ve nam thuc va ((dan vai) or (((dan tai) OR (han tai)))) va triet*.