Perhaps you should try some spelling variations:
thanh trung » thanh tung
cong nguong » cong nguon, cong thuong, cong luong
nguong dan » huong dan
hien xanh » hien hanh, hien nhanh, chieu xanh
trung cua » truong cua, trung tuan, trung cap
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan 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 trung cua cong nguong dan than tap~.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - thanh trung cua cong nguong dan than tap*.