Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
thanh hai » thanh phan, thanh hoa, thanh san
nang cap » nang cao, nang cham, nang phap
hieu van » hieu va, thien van, lieu va
va triet » va thiet, va trien, ve triet
van cac » van hac, van cau, van bac
cac duc » cac du, cao duc, cac dac
su cau » cu cau, su cao, su cu
su can » su van, su cao, tu can
hai va » hai van, thai va, hoi 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 cau) or (tu cac))) or (su can)) ky nang cap cho. hieu van cac duc tan thanh hai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((su cau) OR (tu cac))) OR (su can)) ky nang cap cho. hieu van cac duc tan thanh hai va triet.
• Adding a wildcard symbol may retrieve word variants: ((((su cau) or (tu cac))) or (su can)) ky nang cap cho. hieu van cac duc tan thanh hai va triet*.