Perhaps you should try some spelling variations:
hanh tri » thanh tri, hanh tai, hanh trinh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ve cham » va cham, vu cham, ve chim
ve chat » va chat, van chat
va hanh » van hanh, va thanh, va danh
ma hoi » mai hoi, ma hoa, me hoi
xuc va » duc va, tuc va, luc 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: tu sach ky nang ((ma hoi) OR (xa hoi)). hieu ((ve cham) or (ve chat)) xuc va hanh tri va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ma hoi) OR (xa hoi)). hieu ((ve cham) OR (ve chat)) xuc va hanh tri va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ma hoi) OR (xa hoi)). hieu ((ve cham) or (ve chat)) xuc va hanh tri va thiet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoi) OR (xa hoi)). hieu ((ve cham) or (ve chat)) xuc va hanh tri va thiet*.