Perhaps you should try some spelling variations:
tien manh » tien anh, tien thanh, tieng anh
trinh cua » trinh luat, trinh quan, trinh luan
hang cong » dang cong, hang nong, bang cong
van thanh » ban thanh, van tuan
hoc tien » hoc tieng, hoc hien, hoc vien
tinh cua » sinh cua, tinh chat, tranh cua
ban than » ban thanh, ban hang, ban hanh

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)) hang cong ((ban than) OR (van thanh)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tien manh - hanh ((trinh cua) OR (tinh cua)) hang cong ((ban than) OR (van thanh)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc tien manh - hanh ((trinh cua) or (tinh cua)) hang cong ((ban than) OR (van thanh)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc tien manh - hanh ((trinh cua) or (tinh cua)) hang cong ((ban than) OR (van thanh)) cau*.