Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
duc manh » suc manh, duc anh, duc minh
ke thang » ke trang, le thang, ke thuong
tu sach » thu sach, su sach, te sach
ke phan » ve phan, kenh phan
ly hang » ly quang
ty hang » ty xang, thi hang, thu hang
su viet » so viet
vi su » va su, ve su, ki su

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 ((ty hang) or (ly hang)) xa hoi. hieu ((ke phan) or (ke thang)) duc manh hanh vi su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty hang) OR (ly hang)) xa hoi. hieu ((ke phan) OR (ke thang)) duc manh hanh vi su viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty hang) or (ly hang)) xa hoi. hieu ((ke phan) or (ke thang)) duc manh hanh vi su viet*.