Perhaps you should try some spelling variations:
cac quoc » cac nuoc, cac cuoc, cao quoc
thanh va » thanh van, hanh va, thanh ha
su triet » su viet, su tien
ve triet » va trien
te sach » toc sach
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
gia » giao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (vu sach)) ky nang xa hoi. hieu ve cac quoc gia thanh va ((su triet) OR (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (vu sach)) ky nang xa hoi. hieu ve cac quoc gia thanh va ((su triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (vu sach)) ky nang xa hoi. hieu ve cac quoc gia thanh va ((su triet) OR (ve triet))".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (vu sach)) ky nang xa hoi. hieu ve cac quoc gia thanh va ((su triet) OR (ve triet))*.