Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hanh lai » hanh lam, hanh tai, thanh lap
su sach » so sach, vu sach
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
su tien » su kien, su hien, tu tieng
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
soc va » hoc va, loc va, doc va

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) OR (v nang)) cau hoi. thien ((va cham) or (van thanh)) soc va hanh lai su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (v nang)) cau hoi. thien ((va cham) OR (van thanh)) soc va hanh lai su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (v nang)) cau hoi. thien ((va cham) or (van thanh)) soc va hanh lai su tien".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) OR (v nang)) cau hoi. thien ((va cham) or (van thanh)) soc va hanh lai su tien*.