Perhaps you should try some spelling variations:
lieu viet » sieu viet, lieu vien, tieu viet
viet tech » viet sach
tech nuoc » dich nuoc, sach nuoc
tinh doi » trinh doc, trinh do, tinh hoc
cau tren » cu tren, dau tren, ca tren
nang xa » nang x, lang xa, nang ma
xanh di » danh di, vanh dai, xanh tai
su xac » pu xac, su cac
xac ky » cac ky, sac ky, bac ky

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ky nang xa hoi. lieu viet tech nuoc va ((tinh doi) or (xanh di)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky nang xa hoi. lieu viet tech nuoc va ((tinh doi) OR (xanh di)) cau tren.
• Adding a wildcard symbol may retrieve word variants: su xac ky nang xa hoi. lieu viet tech nuoc va ((tinh doi) or (xanh di)) cau tren*.