Perhaps you should try some spelling variations:
bieu hien » dieu hien, dieu khien, bien phien
hieu hien » dieu hien, chieu chien, dieu khien
hanh lai » hanh lam, hanh tai, thanh lap
su sach » so sach, vu sach
lai cua » dai cua, hai cua, lai chau
te sach » toc sach
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
cac su » cach su, cac sau, cac du
cua te » cua tu
su va » su van, tu 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) or (te sach)) ky nang xa hoi. ((hieu hien) OR (bieu hien)) cac su va hanh lai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) ky nang xa hoi. ((hieu hien) OR (bieu hien)) cac su va hanh lai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (te sach)) ky nang xa hoi. ((hieu hien) OR (bieu hien)) cac su va hanh lai cua te".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) ky nang xa hoi. ((hieu hien) OR (bieu hien)) cac su va hanh lai cua te*.