Perhaps you should try some spelling variations:
thanh tung » thanh cong
vang thanh » van thanh, dang thanh, tang thanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
hiem ngan » kim ngan, viem gan
hang cong » dang cong, hang nong, bang cong
cong vang » cong lang, cong quang, cong ngang
thanh cao » thanh ca, thanh cac, thanh thao
tung hoc » trung hoc, tuong hoc, dung hoc
hoc hang » hoc hanh, hoc bang, hoc tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) or (hiem ngan)) - thanh tung hoc hang cong vang thanh cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hiem ngan)) - thanh tung hoc hang cong vang thanh cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (hiem ngan)) - thanh tung hoc hang cong vang thanh cao*.