Perhaps you should try some spelling variations:
sach tru » sach truc, sach thu, sach tu
tru nang » tra nang, tri nang, truc nano
su triet » su tien, ve triet
thanh de » hanh de, thanh ve, thanh do
va thanh » gia thanh, ban thanh, va tinh
pham duy » pham duc
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
hieu ve » hieu van
nang ho » nang hoc, nang co, tang ho
su viet » so viet
duy va » duy vat, duy van, day va
ho hoi » hoc hoi, hoa hoi, hoi hoi

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 tru nang ho hoi. ((hieu ve) OR (hieu va)) pham duy va thanh de ((su triet) OR (su viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tru nang ho hoi. ((hieu ve) OR (hieu va)) pham duy va thanh de ((su triet) or (su viet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach tru nang ho hoi. ((hieu ve) OR (hieu va)) pham duy va thanh de ((su triet) or (su viet))*.