Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, thien tinh
van nhuong » van chuong, van phuong, van huong
hoc thieu » toc thieu, hoc hien
canh tinh » hanh tinh, manh tinh, canh tranh
cong toan » cong tan, cong hoan, cong tuan
phan cau » phan cac, phan tu, phan lap
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu tinh - canh tinh ((van nhuong) or (va nhung)) cong toan ((phan cau) OR (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tinh - canh tinh ((van nhuong) OR (va nhung)) cong toan ((phan cau) OR (phan dau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu tinh - canh tinh ((van nhuong) or (va nhung)) cong toan ((phan cau) OR (phan dau))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu tinh - canh tinh ((van nhuong) or (va nhung)) cong toan ((phan cau) OR (phan dau))*.