Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh di » thanh doi, thanh de, thanh do
duc gia » quoc gia
hieu va » lieu va, hieu qua
sach tu » sach thu, sach ty, sach uu
nang xa » nang x, lang xa, nang ma
cach tu » cach thuc
hieu ve » hieu van
di cua » dai cua, doi cua, de cua

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 tu) or (cach tu)) nang xa hoi. ((hieu ve) OR (hieu va)) pham duc gia thanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (cach tu)) nang xa hoi. ((hieu ve) OR (hieu va)) pham duc gia thanh di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tu) or (cach tu)) nang xa hoi. ((hieu ve) OR (hieu va)) pham duc gia thanh di cua triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) or (cach tu)) nang xa hoi. ((hieu ve) OR (hieu va)) pham duc gia thanh di cua triet*.