Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
va hanh » van hanh, va thanh, va danh
va tham » van tham, va thanh, va thuat
sach ty » sach tu, sach thu, xach tay
va cham » va chat
su viet » so viet
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai
xu va » xu van, tu va, su 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 ty) OR (sach y)) nang o hoi. hieu ((va cham) or (va tham)) xu va hanh lai su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) nang o hoi. hieu ((va cham) OR (va tham)) xu va hanh lai su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) OR (sach y)) nang o hoi. hieu ((va cham) or (va tham)) xu va hanh lai su viet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) OR (sach y)) nang o hoi. hieu ((va cham) or (va tham)) xu va hanh lai su viet*.