Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc trieu » hoc thieu, hoc tieu, hoc thiet
trung hat » trung nhat, trung phat, trung hai
hoc dieu » hoc thieu, hoc hien
trung ha » trung hoc, trung tam, trung cap
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc trieu) OR (hoc dieu)) tinh - hanh ((trung ha) or (trung hat)) nhung cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc trieu) OR (hoc dieu)) tinh - hanh ((trung ha) OR (trung hat)) nhung cong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc trieu) OR (hoc dieu)) tinh - hanh ((trung ha) or (trung hat)) nhung cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: ((hoc trieu) OR (hoc dieu)) tinh - hanh ((trung ha) or (trung hat)) nhung cong dan toan cao*.