Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
thi dieu » thi lien, thi hien, vi dieu
hanh han » hanh nhan, hanh phan, anh han
hanh san » thanh san, khach san, thanh son
qua dung » quang dung, su dung, qua song
cong tu » cong ty, cong cu, dong tu
tu phan » thu phan, tu nhan, tu phat

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thieu) or (thi dieu)) xanh - ((hanh han) OR (hanh san)) qua dung cong tu phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (thi dieu)) xanh - ((hanh han) OR (hanh san)) qua dung cong tu phan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (thi dieu)) xanh - ((hanh han) OR (hanh san)) qua dung cong tu phan tu".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (thi dieu)) xanh - ((hanh han) OR (hanh san)) qua dung cong tu phan tu*.