Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
thanh lap » thanh san, phan lap, thanh van
va triet » va thiet, va trien, ve triet
ky lang » ky nang, ky dang, ky tang
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ha hoi » hoa hoi, xa hoi, va hoi
ve cac » va cac, vien cac

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 ((ha hoi) OR (ha noi)). hieu ve cac duc va ((thanh lap) or (thanh hai)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky lang ((ha hoi) OR (ha noi)). hieu ve cac duc va ((thanh lap) OR (thanh hai)) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky lang ((ha hoi) OR (ha noi)). hieu ve cac duc va ((thanh lap) or (thanh hai)) va triet".
• Adding a wildcard symbol may retrieve word variants: su sac ky lang ((ha hoi) OR (ha noi)). hieu ve cac duc va ((thanh lap) or (thanh hai)) va triet*.