Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
dang cong » dung cong
trung va » truong va, trang va, trung tam
trung ha » trung hoc, trung tam, trung cap
cong van » cong vang, cong san, song van
van than » van thanh, van thang, van tuan
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 (theo tieu)) xanh - thanh ((trung va) OR (trung ha)) dang cong van than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (theo tieu)) xanh - thanh ((trung va) OR (trung ha)) dang cong van than tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (theo tieu)) xanh - thanh ((trung va) OR (trung ha)) dang cong van than tap".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (theo tieu)) xanh - thanh ((trung va) OR (trung ha)) dang cong van than tap*.