Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
va triet » va thiet, va trien, ve triet
tru nang » tra nang, tri nang, truc nano
hieu va » lieu va, hieu qua
te sach » toc sach
tu nang » tu nong, tu nano, tu lang
cac tuc » cac toc, cac tac, cac nuoc
cac tu » cac thu, cach tu, cac du
dai va » mai va

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. hieu va ((cac tuc) OR (cac tu)) ban 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. hieu va ((cac tuc) OR (cac tu)) ban 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. hieu va ((cac tuc) OR (cac tu)) ban thanh dai va triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((tu nang) or (tru nang)) xa hoi. hieu va ((cac tuc) OR (cac tu)) ban thanh dai va triet*.