Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
nhung cong » dung cong, thong cong, hang cong
hoc chieu » hoc thieu, ho chieu, hoc hien
manh toan » thanh toan, anh tuan, tinh toan
tung cua » trung cua, tuong cua, tang cua
dung cua » dung luan, dung cho
van than » van thanh, van thang, van tuan

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 - thanh ((tung cua) OR (dung cua)) nhung cong ((manh toan) or (van than)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu tinh - thanh ((tung cua) OR (dung cua)) nhung cong ((manh toan) OR (van than)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu tinh - thanh ((tung cua) OR (dung cua)) nhung cong ((manh toan) or (van than)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc chieu tinh - thanh ((tung cua) OR (dung cua)) nhung cong ((manh toan) or (van than)) ban*.