Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh tri » thanh tri, hanh tai, hanh trinh
nang ma » tang ma, sang ma, nang cao
ve cham » va cham, vu cham, ve chim
ve chat » va chat, van chat
xuc van » duc van, luc van, xuc ban
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
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: tu sac ky nang ma hoi. hieu ((ve cham) or (ve chat)) xuc van hanh tri va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ma hoi. hieu ((ve cham) OR (ve chat)) xuc van hanh tri va thiet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ma hoi. hieu ((ve cham) or (ve chat)) xuc van hanh tri va thiet*.