Perhaps you should try some spelling variations:
tranh trong » tran trong, trinh trong, anh trong
kien sach » dien sach, vien bach, kien mac
trong van » trong cac
hoc kien » hoc hien, hoc vien, hoa kien
van dung » van dong, xay dung, tin dung
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc kien sach - tranh trong van dung ((cong dan) OR (cong san)) toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc kien sach - tranh trong van dung ((cong dan) OR (cong san)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc kien sach - tranh trong van dung ((cong dan) OR (cong san)) toan cao*.