Perhaps you should try some spelling variations:
bieu hien » dieu hien, dieu khien, bien phien
hien cac » thien cac, vien cac, hieu cac
van hanh » van thanh, ban hanh, van anh
cac lop » cac hop, cac loai
vai cua » dai cua, hai cua, lai cua
va hanh » va thanh, va danh, ban hanh
su sach » so sach, vu sach
mai hoi » mai khoi, lai hoi, mai doi
dai hoi » dai hoc, dai hai, dai moi
y nang » ky nang, ly nang, v nang
cua te » cua tu

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 y nang ((mai hoi) OR (dai hoi)). bieu hien cac lop ((va hanh) or (van hanh)) vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((mai hoi) OR (dai hoi)). bieu hien cac lop ((va hanh) OR (van hanh)) vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ((mai hoi) OR (dai hoi)). bieu hien cac lop ((va hanh) or (van hanh)) vai cua te".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((mai hoi) OR (dai hoi)). bieu hien cac lop ((va hanh) or (van hanh)) vai cua te*.