Perhaps you should try some spelling variations:
hoc thien » hoc hien, hoc thiet, hoc tien
hoc thieu » toc thieu, hoc hien
canh manh » lanh manh, canh tranh, cach mang
cong cong » cong dong, trong cong, dung cong
manh cua » doanh cua, ban cua
cong tan » cong tac, cong san, cong thanh
toan tai » toan tap, doanh tai, toan ban
toan cao » toan ban, toan tap

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 thien) OR (hoc thieu)) thanh - canh manh cua cong cong tan ((toan tai) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thien) OR (hoc thieu)) thanh - canh manh cua cong cong tan ((toan tai) or (toan cao))~".
• Adding a wildcard symbol may retrieve word variants: ((hoc thien) OR (hoc thieu)) thanh - canh manh cua cong cong tan ((toan tai) or (toan cao))*.