Perhaps you should try some spelling variations:
van chat » cao chat
van hanh » van thanh, ban hanh, van anh
hanh mac » hanh cac, hanh ma, hanh mau
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
ve cham » va cham, ve chat, vu cham
xuc van » duc van, luc van, vuc van
y nang » ky nang, ly nang, v nang
mac va » mac ca, tac va, ac va
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: su sach y nang xa hoi. hieu ((ve cham) or (van chat)) xuc van hanh mac va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu ((ve cham) OR (van chat)) xuc van hanh mac va thiet.
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu ((ve cham) or (van chat)) xuc van hanh mac va thiet*.