Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, dai khoa
cac khoi » cac thoi, cac khoan, cach thoi
cham duc » pham duc, cham soc, pham duy
van hang » van khang, van hoang, van thang
hieu va » lieu va, hieu qua
va cham » va chat, va tham
duc van » duc va, duc tan, duc manh
hang vi » hang va, hanh vi, hang di
cua tu » cua tuc, cua cu, cua te
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky nang ((mai khoi) or (cac khoi)). hieu va cham duc van hang vi ((cua tu) OR (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang ((mai khoi) OR (cac khoi)). hieu va cham duc van hang vi ((cua tu) OR (cua su)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky nang ((mai khoi) or (cac khoi)). hieu va cham duc van hang vi ((cua tu) OR (cua su))".
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang ((mai khoi) or (cac khoi)). hieu va cham duc van hang vi ((cua tu) OR (cua su))*.