Perhaps you should try some spelling variations:
van thiet » va thiet, dan thiet, can thiet
thai van » thi van, thanh van, thai vung
han thai » han tai, ban thai, van thai
va cham » va chat, va tham
su sach » vu sach
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
so sach » so sanh, bo sach, co sach
vu cham » vu kham, tu cham, qua cham
xuc va » duc va, tuc va, luc va
va han » va phan, van han, va hanh

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