Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
hang nong » thang long, han tong
tung tam » dung tam, tuong tac, duong tam
vung tam » vung tau, vung tay, dung tai
nong tac » cong tac, dong tac, nong tan
tac toan » tap toan, tam toan, hach 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 hien xanh - thanh ((((tung tam) or (trung tam))) or (vung tam)) hang nong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - thanh ((((tung tam) OR (trung tam))) OR (vung tam)) hang nong tac toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - thanh ((((tung tam) or (trung tam))) or (vung tam)) hang nong tac toan cao*.