Perhaps you should try some spelling variations:
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
duc manh » suc manh, duc anh, duc tan
duc minh » duc anh
nhan tai » hang tai, van tai
toan tai » toan tap, doanh tai, toan ban
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
cua tu » cua tuc, cua su, cua cu

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 cau ((duc manh) OR (duc minh)) ((nhan tai) or (toan tai)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. thien van cau ((duc manh) OR (duc minh)) ((nhan tai) OR (toan tai)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang xa hoi. thien van cau ((duc manh) OR (duc minh)) ((nhan tai) or (toan tai)) cua tu".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. thien van cau ((duc manh) OR (duc minh)) ((nhan tai) or (toan tai)) cua tu*.