Perhaps you should try some spelling variations:
hang hai » hoang hai, hang tai, thanh hai
so sach » so sanh, bo sach, hoc sach
co sach » bo sach, cuon sach, hoc sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
duc ban » duc tan, dua ban, duc man
duc van » duc va, duc tan, duc manh
hai cua » thai cua, dai cua, hoi cua
va cam » va cham, va cac, va cao
cua te » cua tu

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) OR (co sach)) ky nang xa hoi. hieu va cam ((duc ban) or (duc van)) hang hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) ky nang xa hoi. hieu va cam ((duc ban) OR (duc van)) hang hai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (co sach)) ky nang xa hoi. hieu va cam ((duc ban) or (duc van)) hang hai cua te".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (co sach)) ky nang xa hoi. hieu va cam ((duc ban) or (duc van)) hang hai cua te*.