Perhaps you should try some spelling variations:
ve triet » va trien, su triet
tru nang » tra nang, tri nang, thi nang
hieu van » hieu va, thien van, lieu va
dan hai » doan hai, dang hai, dan khai
truc va » thuc va, thuc vat, trung va
tu sach » thu sach, su sach, te sach
van hoc » van hoa
tuc va » thuc va, tuc xa, duc va
hai ve » hoai ve, hai va, hai vu

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)) xa hoi. hieu van hoc ((tuc va) OR (truc va)) dan hai ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tru nang) OR (truc nano)) xa hoi. hieu van hoc ((tuc va) OR (truc va)) dan hai ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tru nang) or (truc nano)) xa hoi. hieu van hoc ((tuc va) OR (truc va)) dan hai ve triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tru nang) or (truc nano)) xa hoi. hieu van hoc ((tuc va) OR (truc va)) dan hai ve triet*.