Perhaps you should try some spelling variations:
thien chanh » thien thanh, thien chinh, hien hanh
trinh quan » tinh quang, trinh luat, trinh han
nhung cong » dung cong, thong cong, hang cong
trinh cua » tinh cua, trinh luat, trinh luan
tien anh » tieng anh, tien manh, dien anh
cong van » cong vang, cong san, song van
van tan » van tuan, van ban, van tai
tan tap » toan tap, han tap, tan tat

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((tien anh) or (thien chanh)) - hanh ((trinh cua) OR (trinh quan)) nhung cong van tan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tien anh) OR (thien chanh)) - hanh ((trinh cua) OR (trinh quan)) nhung cong van tan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((tien anh) or (thien chanh)) - hanh ((trinh cua) OR (trinh quan)) nhung cong van tan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((tien anh) or (thien chanh)) - hanh ((trinh cua) OR (trinh quan)) nhung cong van tan tap*.