Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh voi » trinh voi, tinh doi, binh voi
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
hoc may » hoc ma
voi cua » hoi cua, doi cua, moi cua
am hoc » ad hoc

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) or (su sach)) ky nang xa hoi. ((hieu va) OR (lieu va)) am hoc may tinh voi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. ((hieu va) OR (lieu va)) am hoc may tinh voi cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang xa hoi. ((hieu va) OR (lieu va)) am hoc may tinh voi cua triet*".