Perhaps you should try some spelling variations:
van thanh » van tuan
ban thanh » ban hanh, ban hang
luu tre » luu tru, cuu tre
su sach » so sach, vu sach
cau tuc » cau truc, cau tu, cau luc
luy tre » luyen tre
y nang » ky nang, ly nang, v nang
va cau » van cau, va cac, va dau
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang o hoi. lieu va cau tuc ((van thanh) or (ban thanh)) vi ((luu tre) OR (luy tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang o hoi. lieu va cau tuc ((van thanh) OR (ban thanh)) vi ((luu tre) OR (luy tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang o hoi. lieu va cau tuc ((van thanh) or (ban thanh)) vi ((luu tre) OR (luy tre))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang o hoi. lieu va cau tuc ((van thanh) or (ban thanh)) vi ((luu tre) OR (luy tre))*.