Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
tru nang » tra nang, tri nang, truc nano
te sach » toc sach
tu nang » tu nong, tu nano, tu lang
cao tuc » dao tuc, cao duc, cao suc
tuc van » thuc van, truc van, tuc va
va cao » va cac, va co, va dao
thiet » thieu

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 tuc van thanh ((dai va) OR (mai va)) thiet~.
• 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 tuc van thanh ((dai va) OR (mai va)) thiet.
• 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 tuc van thanh ((dai va) OR (mai va)) thiet".
• Adding a wildcard symbol may retrieve word variants: te sach ((tu nang) or (tru nang)) xa hoi. lieu va cao tuc van thanh ((dai va) OR (mai va)) thiet*.