Perhaps you should try some spelling variations:
duc phung » duc hung, duc thang, duc trung
hanh lam » thanh lap, hanh kem, dinh lam
thu sach » tu sach, thuat sach, thuoc sach
ve triet » va trien, su triet
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
hanh va » hang va, hanh vi
va cam » va cham, va cac, va cao

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: thu sach ky dang xa hoi. hieu va cam ((duc phung) OR (duc tan)) ((hanh lam) OR (hanh va)) ve triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky dang xa hoi. hieu va cam ((duc phung) or (duc tan)) ((hanh lam) OR (hanh va)) ve triet~".
• Adding a wildcard symbol may retrieve word variants: thu sach ky dang xa hoi. hieu va cam ((duc phung) or (duc tan)) ((hanh lam) OR (hanh va)) ve triet*.