Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
tuan hai » tuan khai, quan hai, tran hai
van tuan » van quan, van ban, anh tuan
ky tang » ky nang, kho tang, ky trong
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, nam duoc
hai su » hai vu, lai su, hai so
su sac » su sach, su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ((ky tang) OR (ky dang)) xa hoi. hieu ve ((cam duc) or (pham duc)) van tuan hai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ((ky tang) OR (ky dang)) xa hoi. hieu ve ((cam duc) OR (pham duc)) van tuan hai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ((ky tang) OR (ky dang)) xa hoi. hieu ve ((cam duc) or (pham duc)) van tuan hai su triet".
• Adding a wildcard symbol may retrieve word variants: su sac ((ky tang) OR (ky dang)) xa hoi. hieu ve ((cam duc) or (pham duc)) van tuan hai su triet*.