Perhaps you should try some spelling variations:
van cham » van tham, va cham, van pham
van chat » cao chat
han thai » han tai, van thai, than thoai
ban thai » ban than, ban thi, ban tai
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
soc va » hoc va, loc va, doc 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: te sach ky nang xa hoi. thien ((van cham) OR (van chat)) soc va ((han thai) or (ban thai)) va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. thien ((van cham) OR (van chat)) soc va ((han thai) OR (ban thai)) va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. thien ((van cham) OR (van chat)) soc va ((han thai) or (ban thai)) va thiet".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. thien ((van cham) OR (van chat)) soc va ((han thai) or (ban thai)) va thiet*.