Perhaps you should try some spelling variations:
hoc chinh » hoan chinh, hoc sinh, hoc kinh
canh sinh » canh binh, tinh sinh, dang sinh
canh tinh » hanh tinh, manh tinh, canh tranh
trong dan » trong dang, trong san, trong tan
vat dung » van dung, va dung, viet dung
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chinh sach - ((canh sinh) or (canh tinh)) vat dung trong dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chinh sach - ((canh sinh) OR (canh tinh)) vat dung trong dan chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc chinh sach - ((canh sinh) or (canh tinh)) vat dung trong dan chan cau*.