Perhaps you should try some spelling variations:
duc thanh » duc thang, duc tan, de thanh
thien van » thi van
duc hanh » duc anh, du hanh, duc manh
toc sach » hoc sach, doc sach, thuoc sach
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
bi van » bui van, vi van, binh van
bi va » bo va

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 ty nang xa hoi. thien van dao ((duc hanh) OR (duc thanh)) hanh ((bi va) or (bi van)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang xa hoi. thien van dao ((duc hanh) OR (duc thanh)) hanh ((bi va) OR (bi van)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang xa hoi. thien van dao ((duc hanh) OR (duc thanh)) hanh ((bi va) or (bi van)) triet".
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang xa hoi. thien van dao ((duc hanh) OR (duc thanh)) hanh ((bi va) or (bi van)) triet*.