Perhaps you should try some spelling variations:
chiet tach » chieu sach
chieu sang » chieu sach, chieu xanh, hieu lang
trinh vat » trinh van, trinh luat, trinh han
hang cong » dang cong, hang nong, bang cong
cong luan » tong luan, cong tuan, dong luan
luan phan » luan van, luan hoan
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: doi ((chiet tach) or (chieu sang)) - hanh ((trinh vat) or (sinh vat)) hang cong luan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chiet tach) OR (chieu sang)) - hanh ((trinh vat) OR (sinh vat)) hang cong luan phan cau.
• Adding a wildcard symbol may retrieve word variants: doi ((chiet tach) or (chieu sang)) - hanh ((trinh vat) or (sinh vat)) hang cong luan phan cau*.