Perhaps you should try some spelling variations:
ngang thanh » nang thanh, nganh thanh, ngan thanh
thanh tung » thanh cong
cong ngang » cong nhan, cong quang, cong lang
hoc thieu » toc thieu, hoc hien
bang cong » dang cong, bang song, hang cong
doc hieu » toc thieu, hoc hien
thanh tu » hanh tu, nhanh tu, thanh thuy
tung va » trung va, tuong va, dung va
va bang » va nang, va lang, va ban

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) or (hoc thieu)) xanh - thanh tung va bang cong ngang thanh tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc thieu)) xanh - thanh tung va bang cong ngang thanh tu.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (hoc thieu)) xanh - thanh tung va bang cong ngang thanh tu*.