Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
va khac » va khao, va kha, vu khac
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cuu tre » cua tre, cau treo
va hac » van hac, va cac, va hoc
san ky » sang ky, van ky, dan ky
tuc va » thuc va, truc va, tuc xa
tu san » thu san, tu ban, tu can

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

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