Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
su triet » su viet, su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
cau duc » cao duc, cau luc, chu duc
van cau » van dau, van hau, van chat
tu sach » thu sach, su sach, te sach
so hai » son hai, su hai, so ha
dat su » sat su
o hoi » co hoi, o hoc, o hai
o lai » o lao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ((o hoi) or (((so hai) or (o lai)))). hieu van cau duc va thanh dat su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((o hoi) OR (((so hai) OR (o lai)))). hieu van cau duc va thanh dat su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hoi) or (((so hai) or (o lai)))). hieu van cau duc va thanh dat su triet*.