Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
su sach » so sach
va hanh » van hanh, va thanh, va danh
va giao » van giao, va giai, ve giao
xang xa » lang xa, mang xa, ang xa
le xang » le tang, le dang, le quang
vu sach » vu bach, vu khach
va gia » va giai
dai va » mai 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 (vu sach)) le xang xa hoi. hieu ((va giao) or (va gia)) duc va hanh dai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) le xang xa hoi. hieu ((va giao) OR (va gia)) duc va hanh dai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) le xang xa hoi. hieu ((va giao) or (va gia)) duc va hanh dai va thiet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) le xang xa hoi. hieu ((va giao) or (va gia)) duc va hanh dai va thiet*.