Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
pham toan » pham tuan, pham tan, phap toan
trang va » hang va
tran van » luan van
tam toan » tap toan, tam than, tam thanh

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 - hanh ((trang va) or (tran van)) thong cong ((tam toan) OR (pham toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - hanh ((trang va) OR (tran van)) thong cong ((tam toan) OR (pham toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - hanh ((trang va) or (tran van)) thong cong ((tam toan) OR (pham toan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh ((trang va) or (tran van)) thong cong ((tam toan) OR (pham toan)) cau*.