Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
trung va » truong va, trang va, trung ha
tran van » luan van
cong anh » cong danh, dong anh, hong anh
tuan cau » toan cau, quan cau, tuan cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu tinh - hanh ((trung va) or (tran van)) dung cong anh tuan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu tinh - hanh ((trung va) OR (tran van)) dung cong anh tuan cau.
• Adding a wildcard symbol may retrieve word variants: ho chieu tinh - hanh ((trung va) or (tran van)) dung cong anh tuan cau*.