Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
danh vai » danh sai, danh va, doanh van
mang xa » lang xa, mang may, dang xay
nang ma » tang ma, sang ma, nang cao
va danh » va dinh, va dan, va hanh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
san ky » sang ky, van ky, dan 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 san ky ((mang xa) or (nang ma)) hoi. ((lieu va) or (hieu qua)) pham duc va danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat san ky ((mang xa) OR (nang ma)) hoi. ((lieu va) OR (hieu qua)) pham duc va danh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: thuat san ky ((mang xa) or (nang ma)) hoi. ((lieu va) or (hieu qua)) pham duc va danh vai cua tre*.