Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
dang luong » nang luong, dung luong, hang luong
hoc thieu » toc thieu, hoc hien
hanh tang » anh tang, hanh mang, hanh tung
luong tai » dung tai, luong va
hoc hieu » hoc hien, doc hieu, hoc dieu
cua dang » cua cong, cua ban
tai toan » bai toan, tap toan, tai tuan
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 hieu) or (hoc thieu)) lang - ((hanh tang) OR (hanh trang)) cua dang luong tai toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hieu) OR (hoc thieu)) lang - ((hanh tang) OR (hanh trang)) cua dang luong tai toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hieu) or (hoc thieu)) lang - ((hanh tang) OR (hanh trang)) cua dang luong tai toan cao".
• Adding a wildcard symbol may retrieve word variants: ((hoc hieu) or (hoc thieu)) lang - ((hanh tang) OR (hanh trang)) cua dang luong tai toan cao*.