Perhaps you should try some spelling variations:
hoc chieu » ho chieu, hoc hien, hoc dieu
hoc thieu » toc thieu, hoc hien
than sinh » than kinh, nhan sinh, thai sinh
dung cong » dung trong
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, van thanh
sinh va » sinh vat, tinh va, dinh van
va dung » van dung, va duong, vat dung

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) or (hoc thieu)) tinh - than sinh va dung cong ((dan toan) or (van toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (hoc thieu)) tinh - than sinh va dung cong ((dan toan) OR (van toan)) cau.
• Adding a wildcard symbol may retrieve word variants: ((hoc chieu) or (hoc thieu)) tinh - than sinh va dung cong ((dan toan) or (van toan)) cau*.