Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
mai khoi » mai khoa, tai khoa, cac khoi
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va, hieu van
va hanh » va thanh, va danh, ban hanh
ky tang » ky nang, ky dang, kho tang
mai hoi » dai hoi, lai hoi, mai doi
ve cham » va cham, ve chat, vu cham
di cua » dai cua, doi cua, de cua
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
cua te » cua tu

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 ky tang ((mai hoi) or (mai khoi)). hieu ve cham truc ((va hanh) OR (van hanh)) di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky tang ((mai hoi) OR (mai khoi)). hieu ve cham truc ((va hanh) OR (van hanh)) di cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky tang ((mai hoi) or (mai khoi)). hieu ve cham truc ((va hanh) OR (van hanh)) di cua te*".