Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
manh xay » nganh xay, van xay, mang xa
dang xay » dang van, van xay
so sach » so sanh, bo sach, co sach
va hanh » van hanh, va thanh, va danh
va giao » van giao, va giai, ve giao
sach le » cach le, sach de, sach lo
va gia » va giai
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: so sach le ((manh xay) or (dang xay)) hoi. hieu ((va giao) or (va gia)) duc va hanh vai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach le ((manh xay) OR (dang xay)) hoi. hieu ((va giao) OR (va gia)) duc va hanh vai va thiet.
• Adding a wildcard symbol may retrieve word variants: so sach le ((manh xay) or (dang xay)) hoi. hieu ((va giao) or (va gia)) duc va hanh vai va thiet*.