Perhaps you should try some spelling variations:
van chat » cao chat
hanh tai » thanh tai, hang tai, han tai
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
tai va » thai va, mai va, tri va
x hoi » xa hoi, o hoi, x ho
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 x hoi. hieu ((van chat) or (va cham)) thuc va hanh tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang x hoi. hieu ((van chat) OR (va cham)) thuc va hanh tai va thiet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang x hoi. hieu ((van chat) or (va cham)) thuc va hanh tai va thiet*.