Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
thanh hoi » thanh hoai, thanh hoa, thanh hai
cua viet » ca viet, hoa viet, cua vat
nang van » dang van, tang van, lang van
hieu van » hieu va, thien van, lieu va
cac duc » cac du, cao duc, cac dac
hoi cua » hoi chuc
su sach » so sach, vu sach
van hoi » van hoa, van hoc, van hoe
hieu ve » hieu va
su sac » 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) or (su sach)) ky nang van hoi. ((hieu ve) or (hieu van)) cac duc tan thanh hoi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su sach)) ky nang van hoi. ((hieu ve) OR (hieu van)) cac duc tan thanh hoi cua viet.
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su sach)) ky nang van hoi. ((hieu ve) or (hieu van)) cac duc tan thanh hoi cua viet*.