Perhaps you should try some spelling variations:
cuu tre » cua tre, cau tren, cau treo
va khac » va khao, va kha, vu khac
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
vi cuu » vi luu, vinh cuu
tuc va » thuc va, truc va, tuc xa
sac ky » cac ky
va hac » van hac, va cac, va hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) OR (sai ky)) nang x ho. hieu ((va hac) or (va khac)) tuc va danh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sai ky)) nang x ho. hieu ((va hac) OR (va khac)) tuc va danh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) OR (sai ky)) nang x ho. hieu ((va hac) or (va khac)) tuc va danh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) OR (sai ky)) nang x ho. hieu ((va hac) or (va khac)) tuc va danh vi cuu tre*.