Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
van thanh » ban thanh, van tuan
va triet » va thiet, va trien, ve triet
tru nang » tra nang, tri nang, truc nano
tuc van » thuc van, truc van, tuc va
te sach » toc sach
tu nang » tu nong, tu nano, tu lang
va cao » va cac, va dao, va bao
dai va » mai va
va co » vo co

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((tu nang) or (tru nang)) xa hoi. lieu ((va cao) OR (va co)) tuc van thanh dai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu nang) OR (tru nang)) xa hoi. lieu ((va cao) OR (va co)) tuc van thanh dai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((tu nang) or (tru nang)) xa hoi. lieu ((va cao) OR (va co)) tuc van thanh dai va triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((tu nang) or (tru nang)) xa hoi. lieu ((va cao) OR (va co)) tuc van thanh dai va triet*.