Perhaps you should try some spelling variations:
tien manh » tien anh, tien thanh, tieng anh
trinh cua » trinh luat, trinh quan, trinh luan
dung cong » dung trong
hoc tien » hoc tieng, hoc hien, hoc vien
tinh cua » sinh cua, tinh chat, tranh cua
cong tan » cong tac, cong san, cong thanh
than cau » toan cau, than cap, thanh chau
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc tien manh - hanh ((trinh cua) or (tinh cua)) dung cong tan ((than cau) or (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tien manh - hanh ((trinh cua) OR (tinh cua)) dung cong tan ((than cau) OR (phan cau)).
• Adding a wildcard symbol may retrieve word variants: hoc tien manh - hanh ((trinh cua) or (tinh cua)) dung cong tan ((than cau) or (phan cau))*.