Perhaps you should try some spelling variations:
sach nuoc » sach duoc, cac nuoc, bach tuoc
hang tai » hang va, dung tai
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
ban tuc » ban tum, ban thuoc, ban duoc
va hang » van hang, va nang, va lang
ban tu » van tu
tai su » tai so, tai tu, lai su

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang xa hoi. hieu qua ((((ban tuc) or (ban tu))) or (sach nuoc)) va hang tai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu qua ((((ban tuc) OR (ban tu))) OR (sach nuoc)) va hang tai su triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu qua ((((ban tuc) or (ban tu))) or (sach nuoc)) va hang tai su triet*.