Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
hai cua » thai cua, dai cua, hoi cua
hai cuu » hai chu, hai cuc, thai cua
cao tuc » dao tuc, cao duc, cao suc
hieu va » lieu va, hieu qua
tu nano » truc nano
tu nang » tru nang, tu nong, tu lang
tuc va » thuc va, truc va, tuc xa
va cao » va cac, va co, va dao
x hoi » xa hoi, o hoi, x ho

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 (tu nano)) x hoi. hieu va cao tuc va thanh ((hai cuu) OR (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu nang) OR (tu nano)) x hoi. hieu va cao tuc va thanh ((hai cuu) OR (hai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((tu nang) or (tu nano)) x hoi. hieu va cao tuc va thanh ((hai cuu) OR (hai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((tu nang) or (tu nano)) x hoi. hieu va cao tuc va thanh ((hai cuu) OR (hai cua)) tre*.