Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
mai khoi » mai khoa, tai khoa, cac khoi
can cuoc » cac cuoc, nhan cuoc, cong cuoc
va hanh » van hanh, va thanh, va danh
ca cuoc » va cuoc, cho cuoc, dao cuoc
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
dai hoi » dai hoc, dai hai, dai moi
ty nang » ky nang, ty xang, ty hang
vi hoa » voi hoa, vi hoc, va hoa

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 ty nang ((mai khoi) or (dai hoi)). hieu vien ((can cuoc) OR (ca cuoc)) va hanh vi hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((mai khoi) OR (dai hoi)). hieu vien ((can cuoc) OR (ca cuoc)) va hanh vi hoa viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ((mai khoi) or (dai hoi)). hieu vien ((can cuoc) OR (ca cuoc)) va hanh vi hoa viet".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((mai khoi) or (dai hoi)). hieu vien ((can cuoc) OR (ca cuoc)) va hanh vi hoa viet*.