Perhaps you should try some spelling variations:
thien van » thi van
toc sach » hoc sach, thuoc sach, nuoc sach
duc manh » duc anh, duc minh, duc tan
doc sach » hoc sach, nuoc sach, dac sac
nhan tai » hang tai, van tai, toan tai
tai cua » thai cua, tai cuc, tri cua
van cau » van dau, van hau, van chat
nang xa » nang x, lang xa, nang ma
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) or (doc sach)) ky nang xa hoi. thien van cau ((duc manh) OR (suc manh)) nhan tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) ky nang xa hoi. thien van cau ((duc manh) OR (suc manh)) nhan tai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (doc sach)) ky nang xa hoi. thien van cau ((duc manh) OR (suc manh)) nhan tai cua tu".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (doc sach)) ky nang xa hoi. thien van cau ((duc manh) OR (suc manh)) nhan tai cua tu*.