Perhaps you should try some spelling variations:
thanh chau » thanh cha, thanh cham, thanh chu
dung cong » dung trong
hoc diep » hoc dieu, hong diep, ngoc diep
cong dan » cong san, cong tan, huong dan
phan cau » phan dau, phan cac, phan tu
bac cua » ban cua, tac cua, bao cua
bai cua » ban cua, dai cua, bai ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc diep tinh - nhanh ((bac cua) OR (bai cua)) dung cong dan ((thanh chau) or (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc diep tinh - nhanh ((bac cua) OR (bai cua)) dung cong dan ((thanh chau) OR (phan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc diep tinh - nhanh ((bac cua) OR (bai cua)) dung cong dan ((thanh chau) or (phan cau))".
• Adding a wildcard symbol may retrieve word variants: hoc diep tinh - nhanh ((bac cua) OR (bai cua)) dung cong dan ((thanh chau) or (phan cau))*.