Perhaps you should try some spelling variations:
nang noi » nang doc
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
noi hai » noi thai, loi hai, noi ha
cac so » cac co, cac bo, cac ho
so van » su van, vo van
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang noi hai. lieu va cac so van hanh ((vi cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang noi hai. lieu va cac so van hanh ((vi cua) OR (di cua)) tre.
• Adding a wildcard symbol may retrieve word variants: te sach ty nang noi hai. lieu va cac so van hanh ((vi cua) or (di cua)) tre*.