Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
trinh thuc » trinh tu
doi chieu » doc hieu, doi chi, mot chieu
trinh thi » trinh tai, dinh thi, trinh tu
dang cong » dung cong
cong van » cong vang, cong san, song van
van tan » van tuan, van ban, van tai
tan tai » toan tai, tang tai, tuan tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu tinh - hanh ((trinh thuc) or (trinh thi)) dang cong van tan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu tinh - hanh ((trinh thuc) OR (trinh thi)) dang cong van tan tai.
• Adding a wildcard symbol may retrieve word variants: doi chieu tinh - hanh ((trinh thuc) or (trinh thi)) dang cong van tan tai*.