Perhaps you should try some spelling variations:
ca trung » cua trung, cac trung, cao trung
nang dai » nang dau, nang tai, lang dai
lang hai » lang chai, lang thai, lang ha
so sanh » do sanh
va tinh » may tinh
va hanh » van hanh, va thanh, va danh
co viet » so viet, o viet, hoc viet
sanh 2 » sach 2, sanh _
vai co » mai co, tai co, voi co
qua ca » qua cac, qua cua, qua cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh 2 ((nang dai) or (lang hai)) hoi. hieu qua ca trung ((va hanh) or (va tinh)) vai co viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh 2 ((nang dai) OR (lang hai)) hoi. hieu qua ca trung ((va hanh) OR (va tinh)) vai co viet.
• Adding a wildcard symbol may retrieve word variants: so sanh 2 ((nang dai) or (lang hai)) hoi. hieu qua ca trung ((va hanh) or (va tinh)) vai co viet*.