Perhaps you should try some spelling variations:
hoc chieu » hoc thieu, ho chieu, hoc dieu
trang van » tran van, trang va, trong van
dong cong » duong cong, dung cong, dang cong
tram van » tran van, tam van, tranh van
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
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 chieu) or (hoc hien)) xanh - hanh ((tram van) OR (trang van)) dong cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (hoc hien)) xanh - hanh ((tram van) OR (trang van)) dong cong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chieu) or (hoc hien)) xanh - hanh ((tram van) OR (trang van)) dong cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: ((hoc chieu) or (hoc hien)) xanh - hanh ((tram van) OR (trang van)) dong cong dan toan cao*.