Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
sach tu » sach thu, cach tu, sach ty
va danh » va dinh, va dan, va hanh
tu sach » thu sach, su sach, te sach
hien tu » khien tu, dien tu
hieu tu » chieu tu, hieu tuc, lieu tu
tu nang » tru nang, tu nong, tu nano
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 tu nang x hoi. ((hieu tu) OR (hien tu)) cham duc va danh ((de su) OR (den su)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu nang x hoi. ((hieu tu) or (hien tu)) cham duc va danh ((de su) OR (den su)) triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang x hoi. ((hieu tu) or (hien tu)) cham duc va danh ((de su) OR (den su)) triet*.