Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
thanh tung » thanh cong
hieu xanh » chieu xanh, hieu manh, dieu hanh
hang cong » dang cong, hang nong, bang cong
cong nang » cong ngang, cong lang, cong nong
nang phat » nang suat, van phat
tung va » trung va, tuong va, dung va
va hang » van hang, va nang, va lang
phat tu » phan tu, pham tu, phap tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu xanh) OR (hieu nganh)) - thanh tung va hang cong nang phat tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) OR (hieu nganh)) - thanh tung va hang cong nang phat tu".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) OR (hieu nganh)) - thanh tung va hang cong nang phat tu*.