Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dieu hien » dieu khien, dieu kien, bieu hien
sach duoc » sach nuoc, sach dao, sach dung
bach tuoc » sach nuoc
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, va hanh
danh du » danh dau, danh tu, dinh du
su sach » so sach, vu sach
du cua » duy cua, dau cua, dum cua
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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 ky nang ((x hoi) OR (o hoi)). dieu hien ((bach tuoc) or (sach duoc)) va danh du cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((x hoi) OR (o hoi)). dieu hien ((bach tuoc) OR (sach duoc)) va danh du cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((x hoi) OR (o hoi)). dieu hien ((bach tuoc) or (sach duoc)) va danh du cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((x hoi) OR (o hoi)). dieu hien ((bach tuoc) or (sach duoc)) va danh du cua triet*.