Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
cham duc » pham duc, cham soc, pham duy
tan hanh » tan thanh, tang hanh, toan hanh
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
tu sai » tu bai, tu san, tu cai
sai ky » sac ky
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky nang ((ma hoi) or (mai khoi)). hieu vu cham duc tan hanh ((vi cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky nang ((ma hoi) OR (mai khoi)). hieu vu cham duc tan hanh ((vi cua) OR (di cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sai ky nang ((ma hoi) or (mai khoi)). hieu vu cham duc tan hanh ((vi cua) or (di cua)) tre*.