Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
cam truc » cau truc, nam truc, lam truoc
hai cau » hai chau, hai chu, hai hau
su sach » so sach
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
vu sach » vu bach, vu khach
ma hoi » mai hoi, xa hoi, ma hoa
va dan » va dao, va dau, va dap
ca dan » cac dan, ca dao
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu sach)) ly nang ma hoi. lieu va cam truc ((va dan) OR (ca dan)) hai cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ly nang ma hoi. lieu va cam truc ((va dan) OR (ca dan)) hai cau theo*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ly nang ma hoi. lieu va cam truc ((va dan) OR (ca dan)) hai cau theo*".