Perhaps you should try some spelling variations:
han thai » han tai, van thai, than thoai
ban thai » ban than, ban thi, ban tai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
vu cham » vu kham, tu cham, qua cham
va cham » va chat, va tham
xuc va » duc va, tuc va, luc va
thiet » thieu

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 ((vu cham) or (va cham)) xuc va ((han thai) OR (ban thai)) va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu ((vu cham) OR (va cham)) xuc va ((han thai) OR (ban thai)) va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu ((vu cham) or (va cham)) xuc va ((han thai) OR (ban thai)) va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu ((vu cham) or (va cham)) xuc va ((han thai) OR (ban thai)) va thiet*.