Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
thuong va » thong va, thuong mai, truong van
truong va » truong dai, truong cao, truong dao
dung cong » dung trong
cong nong » cong dong, cong cong, cong trong
nong phan » nang phan, cong phan, dong phan
doc hieu » toc thieu, hoc hien

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 ((thuong va) OR (truong va)) dung cong nong phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc thieu)) xanh - thanh ((thuong va) OR (truong va)) dung cong nong phan tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (hoc thieu)) xanh - thanh ((thuong va) OR (truong va)) dung cong nong phan tu*".