Perhaps you should try some spelling variations:
tieu tinh » trieu tinh, tieu trinh, lieu tinh
canh tran » canh tranh, hanh trang, banh trang
van thong » van thuong, van phong, va thong
thong dan » thong van, tuong dan, thong den
tran van » luan van
toan tai » toan tap, doanh tai, toan ban
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu tinh - canh tran van thong thong dan ((toan tai) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu tinh - canh tran van thong thong dan ((toan tai) OR (toan cao))*.