Perhaps you should try some spelling variations:
dieu hien » dieu khien, dieu kien, dien bien
bieu hien » dieu khien, bien phien, bien nien
hanh vai » hanh vi, hanh va, hanh tai
cac lop » cac hop, cac loai
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
nang xa » nang x, lang xa, nang ma
sach ky » sac ky, sach ty, sach kem
lop va » lap va, hop va, nop va
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 ky) OR (sach y)) nang xa hoi. ((bieu hien) or (dieu hien)) cac lop va hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) nang xa hoi. ((bieu hien) OR (dieu hien)) cac lop va hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach y)) nang xa hoi. ((bieu hien) or (dieu hien)) cac lop va hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach y)) nang xa hoi. ((bieu hien) or (dieu hien)) cac lop va hanh vai cua te*.