Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
nang mai » nang ma, nang tai, lang mai
van chat » cao chat
tu sach » thu sach, te sach, tu cach
ve chat » va chat
va hanh » van hanh, va thanh, va danh
mai hoi » mai khoi, dai hoi, lai hoi
su sach » so sach, vu sach
xuc va » duc va, tuc va, luc va
vai va » mai va, dai va, hai 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) or (su sach)) ky nang mai hoi. hieu ((ve chat) OR (van chat)) xuc va hanh vai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang mai hoi. hieu ((ve chat) OR (van chat)) xuc va hanh vai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang mai hoi. hieu ((ve chat) OR (van chat)) xuc va hanh vai va thiet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang mai hoi. hieu ((ve chat) OR (van chat)) xuc va hanh vai va thiet*.