Perhaps you should try some spelling variations:
hoc thuyet » hoc chuyen
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc hien, toc thieu
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cau » toan cao, toan ban, toan tap
hoan va » khoan va, hoang va, toan va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thiet) OR (hoc thuyet)) anh - doanh ((hoan va) or (doan va)) nhung cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (hoc thuyet)) anh - doanh ((hoan va) OR (doan va)) nhung cong san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thiet) OR (hoc thuyet)) anh - doanh ((hoan va) or (doan va)) nhung cong san toan cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) OR (hoc thuyet)) anh - doanh ((hoan va) or (doan va)) nhung cong san toan cau*.