Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
tuong tac » cong tac, luong tai, tuong lai
dung cong » dung trong
tung tam » trung tam, vung tam, duong tam
dung tam » duong tam, dung tai, dung lam
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
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: hoc hien xanh - thanh ((((tung tam) OR (tuong tac))) or (dung tam)) dung cong tan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - thanh ((((tung tam) OR (tuong tac))) OR (dung tam)) dung cong tan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - thanh ((((tung tam) OR (tuong tac))) or (dung tam)) dung cong tan toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - thanh ((((tung tam) OR (tuong tac))) or (dung tam)) dung cong tan toan ban*.