Perhaps you should try some spelling variations:
than trong » thang trong, thuan trong, tran trong
trong quan » thong quan, tong quan, thong quang
mong muong » mong muon, long muong, muong duong
hoc thieu » hoc hien
quan mong » quan dong, quan long, quan nong
muong dan » huong dan, muong van, tuong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc thieu) or (hoc thieu)) nganh - than trong quan mong muong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc thieu) OR (hoc thieu)) nganh - than trong quan mong muong dan toan ban.
• Adding a wildcard symbol may retrieve word variants: ((toc thieu) or (hoc thieu)) nganh - than trong quan mong muong dan toan ban*.