Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tru nang » tra nang, tri nang, truc nano
duoc hoi » quoc hoi, duoc hoc, duoc si
hieu van » hieu va, thien van, lieu va
te sach » toc sach
cao duc » dao duc, cao suc, giao duc
hanh va » hang va, hanh vi
cam duc » cam xuc, pham duc, nam duoc
tu nang » tu nong, tu nano, tu lang
cuu tre » cua tre, cau tren, cau treo
va cuu » va cau, va chu, va huu

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