Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuoc ban » thuoc tan, thuoc dang, thu ban
thuc ban » thuc dan, thu ban, thuc van
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
y nang » ly nang, v nang, may nang
va cam » va cham, va cac, va cao
va cua » va chua, via cua, ca cua

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) OR (ky nang)) xa hoi. hieu va cam ((thuc ban) or (thuoc ban)) hang va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ky nang)) xa hoi. hieu va cam ((thuc ban) OR (thuoc ban)) hang va cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (ky nang)) xa hoi. hieu va cam ((thuc ban) or (thuoc ban)) hang va cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) OR (ky nang)) xa hoi. hieu va cam ((thuc ban) or (thuoc ban)) hang va cua triet*.