Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
vu sach » vu bach, su sach, vu khach
vai cua » dai cua, hai cua, lai cua
cao duc » dao duc, cao suc, tao duoc
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
tu nong » tu dong, tu cong, tu tong
tu nang » tru nang, tu nano, tu lang
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((tu nang) OR (tu nong)) mai hoi. hieu va ((cao duc) or (giao duc)) ban thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((tu nang) OR (tu nong)) mai hoi. hieu va ((cao duc) OR (giao duc)) ban thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((tu nang) OR (tu nong)) mai hoi. hieu va ((cao duc) or (giao duc)) ban thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ((tu nang) OR (tu nong)) mai hoi. hieu va ((cao duc) or (giao duc)) ban thanh vai cua tre*.