Perhaps you should try some spelling variations:
lang muong » lang tuong, long muong, nang luong
muong dan » huong dan, muong van, tuong dan
theo cau » theo chu, theo cap, theo dau
cau sach » cao sach, hau sach, rau sach
thang va » hang va, trang va, thanh va
thong va » thong cua, truong va, thong qua
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo cau sach - thanh ((thang va) or (thong va)) lang muong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo cau sach - thanh ((thang va) OR (thong va)) lang muong dan than cau.
• Adding a wildcard symbol may retrieve word variants: theo cau sach - thanh ((thang va) or (thong va)) lang muong dan than cau*.