Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hien xanh » hien hanh, hien nhanh, chieu xanh
trinh han » trinh quan
trinh va » trinh van, trinh vat, trinh ve
cong tan » cong tac, cong san, cong thanh
phan dau » phan tu, hang dau
phan cac » nhan cach, phan lap, phan van

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 - canh ((trinh va) or (trinh han)) nhung cong tan ((phan dau) or (phan cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - canh ((trinh va) OR (trinh han)) nhung cong tan ((phan dau) OR (phan cac)).
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - canh ((trinh va) or (trinh han)) nhung cong tan ((phan dau) or (phan cac))*.