Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
doi chieu » doc hieu, doi chi, ho chieu
trinh hoa » trinh do, trinh han
trinh cho » trinh chao, trinh co, trinh chat
dang cong » dung cong
dan thai » dang thai, dan thi, ban thai
dan than » dan chan, ban than, van than

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 hoa) or (trinh cho)) dang cong ((dan thai) OR (dan than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu tinh - hanh ((trinh hoa) OR (trinh cho)) dang cong ((dan thai) OR (dan than)) cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu tinh - hanh ((trinh hoa) or (trinh cho)) dang cong ((dan thai) OR (dan than)) cao*".