Perhaps you should try some spelling variations:
van chat » cao chat
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, ve chat, ve chim
vu cham » va cham, vu kham, tu cham
tuc van » thuc van, truc van, tuc va
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 (vu cham))) or (van chat)) tuc 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 (vu cham))) OR (van chat)) tuc van hanh tri va thiet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ma hoi. hieu ((((ve cham) or (vu cham))) or (van chat)) tuc van hanh tri va thiet*.