Perhaps you should try some spelling variations:
thien van » thi van
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
van luan » van quan, van tuan, von luan
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cac tuc » cac tu, cac tac, cac nuoc
cac toc » cac toi, cac nuoc, cac thoi
luan vi » quan vi, luan va, luan ve
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: toc sach ky nang xa hoi. thien van ((cac tuc) or (cac toc)) van luan vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. thien van ((cac tuc) OR (cac toc)) van luan vi cua triet.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. thien van ((cac tuc) or (cac toc)) van luan vi cua triet*.