Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
quoc ban » quoc bao, quoc lan, quoc quan
lam quoc » lam duoc, nam quoc, lam thuoc
xach tay » canh tay
hieu van » hieu va, thien van, lieu va
sach tu » sach thu, cach tu, sach ty
van lam » van nam
ban vi » ban voi, ban ve, gan vi
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((xach tay) or (sach tu)) nang x hoi. hieu van lam quoc ban ((ban vi) OR (ban va)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((xach tay) OR (sach tu)) nang x hoi. hieu van lam quoc ban ((ban vi) OR (ban va)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((xach tay) or (sach tu)) nang x hoi. hieu van lam quoc ban ((ban vi) OR (ban va)) cua triet".
• Adding a wildcard symbol may retrieve word variants: tu ((xach tay) or (sach tu)) nang x hoi. hieu van lam quoc ban ((ban vi) OR (ban va)) cua triet*.