Perhaps you should try some spelling variations:
dung doi » huong doi, dung tai, dung co
vat dung » van dung, va dung, viet dung
va triet » va thiet, va trien, ve triet
sach ty » sach tu, sach thu, xach tay
qua cam » qua cham, qua cac, qua ca
cam thu » nam thu, cac thu, ca thu
thu vat » thuc vat, thu va, thuat vat
doi va » hoi va, noi va, dai va
x hoi » xa hoi, o hoi, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ty) or (sach y)) nang ((x hoi) OR (x ho)). hieu qua cam thu vat dung doi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) nang ((x hoi) OR (x ho)). hieu qua cam thu vat dung doi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sach y)) nang ((x hoi) OR (x ho)). hieu qua cam thu vat dung doi va triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach y)) nang ((x hoi) OR (x ho)). hieu qua cam thu vat dung doi va triet*.