Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
hang cong » dang cong, hang nong, bang cong
trang va » hang va
tran van » luan van
cong tac » cong ty
tac phan » tac pham, tai phan, tac phat
phan dau » phan tu, hang dau

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 xanh - canh ((trang va) OR (tran van)) hang cong tac phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - canh ((trang va) OR (tran van)) hang cong tac phan dau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh ((trang va) OR (tran van)) hang cong tac phan dau*.