Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
tuc van » thuc van, truc van, tuc va
van cau » van dau, van hau, van chat
ly nang » ky nang, ly hang, ly vang
cuu tre » cua tre, cau tren, cau treo
va cau » va cac, va dau, va cao
vi cuu » vi luu, vinh cuu
so ha » so hoa, so va
o hai » co hai, so hai, o lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ly nang ((o hai) or (so ha)). lieu ((va cau) or (van cau)) tuc van hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang ((o hai) OR (so ha)). lieu ((va cau) OR (van cau)) tuc van hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ly nang ((o hai) or (so ha)). lieu ((va cau) or (van cau)) tuc van hanh vi cuu tre*.