Perhaps you should try some spelling variations:
doan manh » doan minh, hoang manh, tran manh
day manh » van manh, duc manh, ha manh
nam thuc » nam thuoc, am thuc, nam thu
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ve nam » he nam, va nam, le nam
vai co » mai co, voi co
tai co » mai co, tai so, tri co

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 ky nang xa hoi. hieu ve nam thuc ((day manh) or (doan manh)) ((vai co) OR (tai co)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ve nam thuc ((day manh) OR (doan manh)) ((vai co) OR (tai co)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu ve nam thuc ((day manh) or (doan manh)) ((vai co) OR (tai co)) viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ve nam thuc ((day manh) or (doan manh)) ((vai co) OR (tai co)) viet*.