Perhaps you should try some spelling variations:
thanh trung » thanh tung
theo tien » theo tieu, thuc tien, tien tien
luan dang » luan nang, luan danh, luan dong
dang cong » dung cong
cong tinh » cong trinh, cong vinh, long tinh
anh tang » anh bang, anh dang, anh nang
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo tien) or (theo tcvn)) hanh - ((anh tang) or (thanh trung)) luan dang cong tinh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo tien) OR (theo tcvn)) hanh - ((anh tang) OR (thanh trung)) luan dang cong tinh toan ban.
• Adding a wildcard symbol may retrieve word variants: ((theo tien) or (theo tcvn)) hanh - ((anh tang) or (thanh trung)) luan dang cong tinh toan ban*.