Perhaps you should try some spelling variations:
hoc thuyet » hoc chuyen
thuyet xac » thuyet va, thuyet bai
trinh quan » tinh quang, trinh luat, trinh han
trinh cua » tinh cua, trinh luat, trinh luan
dung cong » dung trong
cong vang » cong lang, cong quang, cong ngang
vang toan » van toan, dang toan, quang toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thuyet xac - hanh ((trinh cua) OR (trinh quan)) dung cong vang toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thuyet xac - hanh ((trinh cua) OR (trinh quan)) dung cong vang toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc thuyet xac - hanh ((trinh cua) OR (trinh quan)) dung cong vang toan cau*.