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