Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cua quoc » cua nuoc, cua thuoc
thanh vi » hanh vi, thanh va, thanh ve
thu sach » thuat sach, thuoc sach, thu hoach
nang lai » nang tai, mang lai, nang cai
xuc van » duc van, luc van, vuc van
tu sach » su sach, te sach, tu cach
lai hoi » dai hoi, lai hoa, lai roi
ve cac » va cac, vien cac
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua
ve cam » ve cham, va cam, ve cai

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 (thu sach)) y nang lai hoi. hieu ((ve cam) or (ve cac)) xuc van thanh vi cua quoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang lai hoi. hieu ((ve cam) OR (ve cac)) xuc van thanh vi cua quoc.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y nang lai hoi. hieu ((ve cam) or (ve cac)) xuc van thanh vi cua quoc*.