Perhaps you should try some spelling variations:
hoc thien » hoc hien, hoc thieu, hoc thiet
thien anh » thien danh, tien anh, thien thanh
tran xuan » tran quang, tran van
dung cua » dung luan, dung cho
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
toan cau » 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 thien anh - thanh ((dung cua) or (tran xuan)) thong ((cong dan) OR (cong tan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien anh - thanh ((dung cua) OR (tran xuan)) thong ((cong dan) OR (cong tan)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thien anh - thanh ((dung cua) or (tran xuan)) thong ((cong dan) OR (cong tan)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc thien anh - thanh ((dung cua) or (tran xuan)) thong ((cong dan) OR (cong tan)) toan cau*.