Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, tu cach
te sach » toc sach
mai hoi » mai khoi, dai hoi, lai hoi
cac dat » cac dan, cai dat, cac dai
dat van » dao van, dat va, dam van
v nang » va nang, vu nang, van nang
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (te sach)) v nang ((ma hoa) or (mai hoi)). lieu va cac dat van hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) v nang ((ma hoa) OR (mai hoi)). lieu va cac dat van hanh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) v nang ((ma hoa) or (mai hoi)). lieu va cac dat van hanh vi cua vat*.