Perhaps you should try some spelling variations:
cham duc » cham soc, pham duy, phan duc
hanh hai » thanh hai, nhanh hai, hang hai
hoi nang » hoi lang, ho nang, hoa nang
van hanh » van thanh, ban hanh, van anh
hai cua » thai cua, dai cua, hoi cua
tu sach » thu sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
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: ((tu sach) or (su sach)) hoi nang xa hoi. hieu qua ((cham duc) OR (pham duc)) van hanh hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) hoi nang xa hoi. hieu qua ((cham duc) OR (pham duc)) van hanh hai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) hoi nang xa hoi. hieu qua ((cham duc) OR (pham duc)) van hanh hai cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) hoi nang xa hoi. hieu qua ((cham duc) OR (pham duc)) van hanh hai cua te*.