Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thuat sac » thuat sach, thuat san, thuat tac
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, thien van, lieu va
nam dua » nam da, nam mua, nam qua
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sac ky nang ((xa hoi) or (ma hoa)). hieu van ((nam dua) or (nam cua)) ban thanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sac ky nang ((xa hoi) OR (ma hoa)). hieu van ((nam dua) OR (nam cua)) ban thanh vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: thuat sac ky nang ((xa hoi) or (ma hoa)). hieu van ((nam dua) or (nam cua)) ban thanh vai cuu tre*.