Perhaps you should try some spelling variations:
van thiet » va thiet, dan thiet, can thiet
han thai » han tai, ban thai, van thai
thai van » thi van, thanh van, thai vung
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
ve cham » ve chat, vu cham, ve chim
va cham » va chat, va tham
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: so sach ty nang xa hoi. hieu ((ve cham) or (va cham)) xuc va han thai van thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang xa hoi. hieu ((ve cham) OR (va cham)) xuc va han thai van thiet.
• Adding a wildcard symbol may retrieve word variants: so sach ty nang xa hoi. hieu ((ve cham) or (va cham)) xuc va han thai van thiet*.