Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
bieu hien » dieu hien, dieu khien, bien phien
hien cac » thien cac, vien cac, hieu cac
hang di » hang doi, hang vi, hang dien
hanh di » hanh vi, hanh de, danh di
vu sach » vu bach, vu khach
nang xa » nang x, lang xa, nang ma
su sach » so sach
cac tuc » cac toc, cac tu, cac tac
tuc va » thuc va, truc va, tuc xa

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

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