Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc thien » hoc hien, hoc thieu, hoc tien
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trinh vat » trinh van, trinh luat, sinh vat
trinh va » trinh van, trinh ve, trinh vi
cong dan » cong san, cong tan, huong dan
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 thien) or (hoc thiet)) anh - hanh ((trinh va) OR (trinh vat)) nhung cong dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thien) OR (hoc thiet)) anh - hanh ((trinh va) OR (trinh vat)) nhung cong dan chan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thien) or (hoc thiet)) anh - hanh ((trinh va) OR (trinh vat)) nhung cong dan chan cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc thien) or (hoc thiet)) anh - hanh ((trinh va) OR (trinh vat)) nhung cong dan chan cau*.