Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
trinh han » trinh quan
theo kha » theo phap, thao khoa, theo chu
kha nang » phap nang, ky nang, ki nang
tang cua » mang cua, tang luan, thong cua
hang cua » mang cua, hang ca, huong cua
han cau » hang cau, phan cau, van cau

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

• If you are trying to use Boolean operators, they must be ALL CAPS: theo kha nang - hanh ((((tang cua) OR (dung luan))) OR (hang cua)) thong cong trinh han cau~.
• Adding a wildcard symbol may retrieve word variants: theo kha nang - hanh ((((tang cua) or (dung luan))) or (hang cua)) thong cong trinh han cau*.