Perhaps you should try some spelling variations:
tru nang » tri nang, truc nano, thi nang
tra nang » thi nang, kha nang, da nang
pham duy » pham duc
ve triet » va trien, su triet
tu sach » thu sach, su sach, te sach
hieu tu » chieu tu, hieu tuc, hien tu
tu pham » thu pham, su pham, tu phat
va danh » va dinh, va dan, va hanh
danh de » hanh de, dan de, dang de
duy va » duy vat, duy van, day va

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) OR (tra nang)) xa hoi. hieu tu pham duy va danh de ve triet~.
• Adding a wildcard symbol may retrieve word variants: tu sach ((tru nang) or (tra nang)) xa hoi. hieu tu pham duy va danh de ve triet*.