Perhaps you should try some spelling variations:
dieu tinh » diep tinh, lieu tinh, dien tinh
trung hat » trung nhat, trung phat, trung hai
hang cong » dang cong, hang nong, bang cong
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 dieu tinh - hanh ((trung ha) or (trung hat)) hang cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc dieu tinh - hanh ((trung ha) OR (trung hat)) hang cong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc dieu tinh - hanh ((trung ha) or (trung hat)) hang cong dan toan cao*.