Perhaps you should try some spelling variations:
truong cong » trong cong, truong dong, truong long
chieu sach » chiet tach, chieu sang, chieu xanh
trinh cac » trinh chat, trinh chao, trinh cham
trinh cau » trinh chat, trinh chao, trinh tu
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan
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 ((chieu sach) or (chinh sach)) - hanh ((trinh cac) OR (trinh cau)) truong cong tan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chinh sach)) - hanh ((trinh cac) OR (trinh cau)) truong cong tan phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (chinh sach)) - hanh ((trinh cac) OR (trinh cau)) truong cong tan phan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chinh sach)) - hanh ((trinh cac) OR (trinh cau)) truong cong tan phan cau*.