Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
han tai » hang tai, nhan tai, van tai
van han » van hanh, van phan, van nhan
duc van » duc va, duc tan, duc manh
nang xa » lang xa, nang ma, mang xa
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
vu sac » vu sach, vu san, vu cac
tai va » thai va, mai va, tri va
va sac » va cac, va suc, va san
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: ((vu sac) OR (va sac)) ky ((nang xa) or (nang x)) hoi. hieu vu cham duc van han tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sac) OR (va sac)) ky ((nang xa) OR (nang x)) hoi. hieu vu cham duc van han tai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sac) OR (va sac)) ky ((nang xa) or (nang x)) hoi. hieu vu cham duc van han tai va thiet".
• Adding a wildcard symbol may retrieve word variants: ((vu sac) OR (va sac)) ky ((nang xa) or (nang x)) hoi. hieu vu cham duc van han tai va thiet*.