Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
trinh van » trinh quan, trinh toan, dinh van
trinh han » trinh quan
hang cong » dang cong, hang nong, bang cong
cong tac » cong ty
tac phan » tac pham, tai phan, tac phat
phan lap » phan dau

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