Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
ky lang » ky dang, ky tang, tay lang
hieu ve » hieu va, hieu van
hanh di » hanh vi, hanh de, hang di
su sac » su sach, su cac, su xac
ve coc » ve cuoc, ve cac, ve co
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
di va » dai va, di vao, doi va

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 lang) or (ky nang)) xa hoi. hieu ve coc ((luc va) OR (tuc va)) hanh di va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ((ky lang) OR (ky nang)) xa hoi. hieu ve coc ((luc va) OR (tuc va)) hanh di va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ((ky lang) or (ky nang)) xa hoi. hieu ve coc ((luc va) OR (tuc va)) hanh di va trien".
• Adding a wildcard symbol may retrieve word variants: su sac ((ky lang) or (ky nang)) xa hoi. hieu ve coc ((luc va) OR (tuc va)) hanh di va trien*.