Perhaps you should try some spelling variations:
thanh tran » thanh trang, thanh toan, thanh tra
hoc thieu » toc thieu, hoc hien
tran nang » tra nang, tran dang, tran quang
nang tong » nang trong, nang song, nang dong
doc hieu » toc thieu, hoc hien
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
than tap » toan tap, han tap, phan 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 thieu) or (doc hieu)) xanh - thanh tran nang tong ((cong dan) OR (cong tan)) than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (doc hieu)) xanh - thanh tran nang tong ((cong dan) OR (cong tan)) than tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (doc hieu)) xanh - thanh tran nang tong ((cong dan) OR (cong tan)) than tap".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (doc hieu)) xanh - thanh tran nang tong ((cong dan) OR (cong tan)) than tap*.