Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
lanh hai » manh hai, thanh hai, lang chai
ban lanh » ban hanh, ban linh, ban anh
dang xay » dang van, van xay
cac dac » cac dan, cac dai, cac bac
cac duc » cac du, cao duc, cac nuoc
su sach » vu sach
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
so sach » so sanh, bo sach, co sach
hai su » hai vu, lai su, hai so

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