Perhaps you should try some spelling variations:
thien van » thi van
van tuan » van quan, van ban, anh tuan
toc sach » hoc sach, doc sach, thuoc sach
cac tuc » cac tu, cac tac, cac nuoc
sach ky » sac ky, sach y, sach ty
cac toc » cac toi, cac nuoc, cac thoi
vi cua » vai cua
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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