Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
danh hai » dang hai, lanh hai, manh hai
hieu van » hieu va, thien van, hieu ve
hai cau » hai chau, hai chu, hai hau
so sanh » do sanh
nang ma » tang ma, sang ma, nang cao
sanh ly » sinh ly, doanh ly, khanh ly
ly nang » ky nang, ly hang, ly vang
tuc va » thuc va, truc va, duc va
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh ly nang ma hoi. ((hieu van) or (lieu va)) cam ((tuc va) OR (tuc xa)) danh hai cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ly nang ma hoi. ((hieu van) OR (lieu va)) cam ((tuc va) OR (tuc xa)) danh hai cau theo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ly nang ma hoi. ((hieu van) or (lieu va)) cam ((tuc va) OR (tuc xa)) danh hai cau theo".
• Adding a wildcard symbol may retrieve word variants: so sanh ly nang ma hoi. ((hieu van) or (lieu va)) cam ((tuc va) OR (tuc xa)) danh hai cau theo*.