Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
suu viet » su viet, sau viet, sieu viet
hanh dao » lanh dao, thanh dam, doanh dao
cao tuc » dao tuc, cao duc, cao suc
tu sach » thu sach, te sach, tu cach
hieu va » lieu va, hieu qua
may hoi » may thoi, tay hoi, mai hoi
ke mang » ke nang, ke trang
su sach » so sach, vu sach
tuc va » thuc va, truc va, tuc xa
va cao » va cac, va co, va dao

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 (su sach)) ke mang may hoi. hieu va cao tuc va ((hanh dao) OR (thanh dat)) suu viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ke mang may hoi. hieu va cao tuc va ((hanh dao) OR (thanh dat)) suu viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ke mang may hoi. hieu va cao tuc va ((hanh dao) OR (thanh dat)) suu viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ke mang may hoi. hieu va cao tuc va ((hanh dao) OR (thanh dat)) suu viet*.