Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
duc manh » suc manh, duc minh, duc tan
ca viet » va viet, co viet, hoa viet
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
ve cam » ve cham, ve cac, va cam
su dai » sau dai, si dai, su tai
tai ca » tai cac, tai cao, tai cua
su sai » su tai, su hai, su mai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sai) OR (su dai)) ky dang xa hoi. hieu ve cam ((duc manh) or (duc anh)) hanh tai ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sai) OR (su dai)) ky dang xa hoi. hieu ve cam ((duc manh) OR (duc anh)) hanh tai ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sai) OR (su dai)) ky dang xa hoi. hieu ve cam ((duc manh) or (duc anh)) hanh tai ca viet".
• Adding a wildcard symbol may retrieve word variants: ((su sai) OR (su dai)) ky dang xa hoi. hieu ve cam ((duc manh) or (duc anh)) hanh tai ca viet*.