Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien can » vien canh, vien cac, vien cao
can cuoc » ca cuoc, cac cuoc, nhan cuoc
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
dai hoi » dai hoc, dai hai, dai moi
mai hoi » mai khoi, lai hoi, mai doi
ty nang » ky nang, ty xang, ty hang
di cua » dai cua, doi cua, de cua

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 hoi) or (dai hoi)). hieu vien can cuoc ((va hanh) or (va danh)) di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((mai hoi) OR (dai hoi)). hieu vien can cuoc ((va hanh) OR (va danh)) di cua vat.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((mai hoi) or (dai hoi)). hieu vien can cuoc ((va hanh) or (va danh)) di cua vat*.