Perhaps you should try some spelling variations:
van cham » van chat, van tham, va cham
han thai » han tai, ban thai, van thai
cham sac » cham soc, pham sach, cap sac
hieu van » hieu va, thien van, lieu va
thai va » thai van
nang xa » nang x, lang xa, nang ma
van han » van hanh, van phan, van nhan
sac van » cac van, san van, sat van
long ha » dong ha, cong ha, dong hoa
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
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: tu san ky ((nang xa) or (((lang ha) or (long ha)))) hoi. hieu van cham sac van han thai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky ((nang xa) OR (((lang ha) OR (long ha)))) hoi. hieu van cham sac van han thai va thiet.
• Adding a wildcard symbol may retrieve word variants: tu san ky ((nang xa) or (((lang ha) or (long ha)))) hoi. hieu van cham sac van han thai va thiet*.