Perhaps you should try some spelling variations:
chiet tach » chieu sach
thong cong » trong cong, tong cong, thong thong
hieu manh » chieu xanh, hieu nganh, dieu hanh
tran van » luan van
cong van » cong vang, cong san, song van
tra van » ta van, trang van, tranh van
van tan » van tuan, van ban, van tai
tan cua » than cua, tang cua, toan cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu manh) or (chiet tach)) - thanh ((tra van) OR (tran van)) thong cong van tan cua~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu manh) OR (chiet tach)) - thanh ((tra van) OR (tran van)) thong cong van tan cua.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu manh) or (chiet tach)) - thanh ((tra van) OR (tran van)) thong cong van tan cua".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu manh) or (chiet tach)) - thanh ((tra van) OR (tran van)) thong cong van tan cua*.