Perhaps you should try some spelling variations:
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
van tuan » van quan, van ban, anh tuan
cac toc » cac toi, cac nuoc, cac thoi
tuan vi » quan vi, luan vi, quans vi
cac tuc » cac tu, cac tac, cac nuoc
nang xa » nang x, lang xa, nang ma
vi cua » vai cua, di cua
cua te » cua tu

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