Perhaps you should try some spelling variations:
thanh trong » thanh trung, tranh trong, hanh trong
trong chuan » thong chuan, trong chan, trong thuan
hoc thieu » toc thieu, hoc hien
bang cong » bang song, hang cong, dung cong
dang cong » dung cong
manh toan » thanh toan, anh tuan, tinh toan
doc hieu » toc thieu, hoc hien
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: ((doc hieu) or (hoc thieu)) xanh - thanh trong chuan ((bang cong) OR (dang cong)) manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc thieu)) xanh - thanh trong chuan ((bang cong) OR (dang cong)) manh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (hoc thieu)) xanh - thanh trong chuan ((bang cong) OR (dang cong)) manh toan ban".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (hoc thieu)) xanh - thanh trong chuan ((bang cong) OR (dang cong)) manh toan ban*.