Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
quan tre » quan tren, quan tri, quang tri
bo sach » hoc sach
co sach » cuon sach, hoc sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va bao » va bai
xuc va » tuc va, luc va, xac va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((bo sach) OR (co sach)) ky nang xa hoi. hieu va bao ((xuc va) or (duc va)) hanh trinh quan tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((bo sach) OR (co sach)) ky nang xa hoi. hieu va bao ((xuc va) OR (duc va)) hanh trinh quan tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((bo sach) OR (co sach)) ky nang xa hoi. hieu va bao ((xuc va) or (duc va)) hanh trinh quan tre".
• Adding a wildcard symbol may retrieve word variants: ((bo sach) OR (co sach)) ky nang xa hoi. hieu va bao ((xuc va) or (duc va)) hanh trinh quan tre*.