Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
lanh hai » manh hai, thanh hai, lang chai
ban lanh » ban hanh, ban linh, ban anh
hai cua » thai cua, dai cua, hoi cua
cac duc » cao duc, cac dac, cac nuoc
su sach » so sach, vu sach
xay hoi » xa hoi, tay hoi, cay phoi
ky danh » ky anh
ky dang » ky nang
hieu va » lieu va, hieu qua

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 dang) or (ky danh)) xay hoi. hieu va ((cac duc) OR (cac du)) ban lanh hai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky dang) OR (ky danh)) xay hoi. hieu va ((cac duc) OR (cac du)) ban lanh hai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky dang) or (ky danh)) xay hoi. hieu va ((cac duc) OR (cac du)) ban lanh hai cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky dang) or (ky danh)) xay hoi. hieu va ((cac duc) OR (cac du)) ban lanh hai cua triet*.