Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
duoc hoi » quoc hoi, duoc hoc, duoc si
van cam » van nam, van lam, van cau
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cam duc » cam xuc, cao duc, pham duc
te cach » ve cach, te sach, tu cach
tu nano » truc nano
tu nang » tru nang, tu nong, 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 cach ((tu nang) OR (tu nano)) duoc hoi. hieu van cam duc ((va hanh) or (va danh)) va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cach ((tu nang) OR (tu nano)) duoc hoi. hieu van cam duc ((va hanh) OR (va danh)) va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cach ((tu nang) OR (tu nano)) duoc hoi. hieu van cam duc ((va hanh) or (va danh)) va cuu tre".
• Adding a wildcard symbol may retrieve word variants: te cach ((tu nang) OR (tu nano)) duoc hoi. hieu van cam duc ((va hanh) or (va danh)) va cuu tre*.