Perhaps you should try some spelling variations:
thong duong » tuong duong, thong dung, thong huong
duong manh » duong van
thue xanh » thue thanh, thuy anh, thu canh
manh toan » thanh toan, anh tuan, tinh toan
trang va » tran van, hang va
toan cau » toan cao, toan ban, toan tap
lan van » luan van, lang van, tan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: cho ((thue xanh) OR (thuc hanh)) - hanh ((trang va) or (lan van)) thong duong manh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: cho ((thue xanh) OR (thuc hanh)) - hanh ((trang va) OR (lan van)) thong duong manh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "cho ((thue xanh) OR (thuc hanh)) - hanh ((trang va) or (lan van)) thong duong manh toan cau".
• Adding a wildcard symbol may retrieve word variants: cho ((thue xanh) OR (thuc hanh)) - hanh ((trang va) or (lan van)) thong duong manh toan cau*.