Perhaps you should try some spelling variations:
hanh dam » thanh dam, hanh lam, hanh nam
nang xa » lang xa, nang ma, mang xa
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
va cam » va cac, va cao, va cai
dam va » dam van, nam va, dam ha
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: su sac ky ((nang xa) or (nang x)) hoi. hieu ((va cam) or (va cham)) duc va hanh dam va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((nang xa) OR (nang x)) hoi. hieu ((va cam) OR (va cham)) duc va hanh dam va thiet.
• Adding a wildcard symbol may retrieve word variants: su sac ky ((nang xa) or (nang x)) hoi. hieu ((va cam) or (va cham)) duc va hanh dam va thiet*.