Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
can cuoc » ca cuoc, cac cuoc, nhan cuoc
vien can » vien canh, vien cac, vien cao
dai moi » doi moi, dai hoi
mai hoi » mai khoi, dai hoi, lai hoi
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cuoc va » nuoc va, duoc va, quoc va
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
vi hoa » voi hoa, va hoa, bi hoa
vi hoc » li hoc, va hoc

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