Perhaps you should try some spelling variations:
ranh mach » trinh mach, tinh mach
cua viet » ca viet, hoa viet, cua vat
ban mach » ban sach, ban hanh, ban dich
vu khach » vu khanh, vu khac, vay khach
hoi cua » hoi chuc
vu sach » vu bach, su sach
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
cac duc » cac du, cao duc, cac dac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (vu khach)) ky nang xa hoi. hieu va cac duc ((ban mach) OR (ranh mach)) hoi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ky nang xa hoi. hieu va cac duc ((ban mach) OR (ranh mach)) hoi cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (vu khach)) ky nang xa hoi. hieu va cac duc ((ban mach) OR (ranh mach)) hoi cua viet*".