Perhaps you should try some spelling variations:
hanh vai » hanh va, hanh tai, hanh van
te sach » toc sach
cao tuc » dao tuc, cao duc, cao suc
hieu va » lieu va, hieu qua
tu nong » tu dong, tu cong, tu tong
tu nang » tru nang, tu nano, tu lang
cuu tre » cua tre, cau tren, cau treo
va cao » va cac, va co, va dao
tuc va » thuc va, truc va, tuc xa
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 nong)) x hoi. hieu va cao tuc va ((hanh vai) or (hanh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu nang) OR (tu nong)) x hoi. hieu va cao tuc va ((hanh vai) OR (hanh vi)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((tu nang) OR (tu nong)) x hoi. hieu va cao tuc va ((hanh vai) or (hanh vi)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((tu nang) OR (tu nong)) x hoi. hieu va cao tuc va ((hanh vai) or (hanh vi)) cuu tre*.