Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
tai cuu » tai cuc, tai buu, tai cua
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va
dai hoi » dai hoc, dai hai, dai moi
co loc » co hoc, co loi, co doc
loc va » hoc va, luc 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 ky nang ((cau hoi) or (dai hoi)). ((hieu ve) OR (hieu van)) co loc va hanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((cau hoi) OR (dai hoi)). ((hieu ve) OR (hieu van)) co loc va hanh tai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((cau hoi) or (dai hoi)). ((hieu ve) OR (hieu van)) co loc va hanh tai cuu tre*".