Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
hoc chieu » hoc thieu, ho chieu, hoc hien
thong cua » thong quan, thong tu, huong cua
trong dan » trong dang, trong san, trong tan
hang tai » hang va, dung tai
dan toan » van toan, dan than, manh toan
toan cau » 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: hoc chieu tinh - hanh ((thong cua) or (hang tai)) dung trong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu tinh - hanh ((thong cua) OR (hang tai)) dung trong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc chieu tinh - hanh ((thong cua) or (hang tai)) dung trong dan toan cau*.