Perhaps you should try some spelling variations:
ve triet » va trien, su triet
tru nang » tra nang, tri nang, thi nang
cham duc » pham duc, cham soc, pham duy
danh de » hanh de, dan de, dang de
va danh » va dinh, va dan, va hanh
tu cham » toc cham, thi cham
hieu tu » chieu tu, hieu tuc, hien tu
tu sach » thu sach, su sach, te sach
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((tru nang) or (truc nano)) ((x hoi) OR (o hoi)). hieu tu cham duc va danh de ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tru nang) OR (truc nano)) ((x hoi) OR (o hoi)). hieu tu cham duc va danh de ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tru nang) or (truc nano)) ((x hoi) OR (o hoi)). hieu tu cham duc va danh de ve triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tru nang) or (truc nano)) ((x hoi) OR (o hoi)). hieu tu cham duc va danh de ve triet*.