Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, thien tinh
trinh luan » trinh luat, trinh quan, trinh han
hoc thieu » toc thieu, hoc hien
hang nong » thang long, han tong
sinh cua » manh cua, dinh cuu
nong dan » cong dan, nong san, nguong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
sinh va » sinh vat, tinh va, dinh van

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tinh - hanh ((trinh luan) OR (((sinh cua) OR (sinh va)))) hang nong dan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu tinh - hanh ((trinh luan) or (((sinh cua) OR (sinh va)))) hang nong dan toan cao~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu tinh - hanh ((trinh luan) or (((sinh cua) OR (sinh va)))) hang nong dan toan cao*.