Perhaps you should try some spelling variations:
thanh xay » thanh tay, thanh lay, thanh xuan
hanh vai » hanh vi, hanh va, hanh tai
su sach » vu sach
va hanh » van hanh, va thanh, va danh
xay hoi » xa hoi, tay hoi, cay phoi
so sach » so sanh, bo sach, co sach
ve dao » de dao, va dao, te dao
ve bao » te bao, va bao
vai va » mai va, dai va, hai va
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sach)) le thanh xay hoi. hieu ((ve dao) OR (ve bao)) duc va hanh vai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) le thanh xay hoi. hieu ((ve dao) OR (ve bao)) duc va hanh vai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) le thanh xay hoi. hieu ((ve dao) OR (ve bao)) duc va hanh vai va thiet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) le thanh xay hoi. hieu ((ve dao) OR (ve bao)) duc va hanh vai va thiet*.