Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thien van » thi van
van tuan » van quan, van ban, anh tuan
cac toc » cac toi, cac nuoc, cac thoi
tuan vi » quan vi, luan vi, quans vi
te sach » toc sach
ky lang » ky dang, ky tang, tay lang
cac tuc » cac tu, cac tac, cac nuoc
vi cua » vai cua, di cua

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 ((ky lang) OR (ky nang)) xa hoi. thien van ((cac tuc) or (cac toc)) van tuan vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky lang) OR (ky nang)) xa hoi. thien van ((cac tuc) OR (cac toc)) van tuan vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky lang) OR (ky nang)) xa hoi. thien van ((cac tuc) or (cac toc)) van tuan vi cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky lang) OR (ky nang)) xa hoi. thien van ((cac tuc) or (cac toc)) van tuan vi cua triet*.