Perhaps you should try some spelling variations:
sach tri » sach tai, sach tren, sach truc
tri nang » thi nang, tra nang, tri bang
cham duc » pham duc, cham soc, pham duy
hieu tuc » hieu thuc, hieu luc, hieu thuoc
tu sach » thu sach, su sach, te sach
hien tu » khien tu, dien tu
va dan » ca dan, va dao, va dau
den su » dan su, nen su
x hoi » xa hoi, o hoi, x ho
de su » ve su, de tu, da su

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tri nang x hoi. ((hieu tuc) OR (hien tu)) cham duc va dan ((de su) OR (den su)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tri nang x hoi. ((hieu tuc) or (hien tu)) cham duc va dan ((de su) OR (den su)) triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach tri nang x hoi. ((hieu tuc) or (hien tu)) cham duc va dan ((de su) OR (den su)) triet*.