Perhaps you should try some spelling variations:
cam truc » cau truc, nam truc, lam truoc
truc may » tren may, truc va
cuc tieu » muc tieu, cac tieu, cach tieu
so sach » so sanh, bo sach, co sach
sach va » sach xa, sach ha, sach dao
va nang » van nang, da nang, cam nang
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
cuc te » cua te, cuc thue
tinh » trinh, minh, kinh

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach va nang ma hoi. lieu va cam truc may (tinh OR dinh) dien ((cuc te) or (cuc tieu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach va nang ma hoi. lieu va cam truc may (tinh OR dinh) dien ((cuc te) OR (cuc tieu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach va nang ma hoi. lieu va cam truc may (tinh OR dinh) dien ((cuc te) or (cuc tieu))".
• Adding a wildcard symbol may retrieve word variants: so sach va nang ma hoi. lieu va cam truc may (tinh OR dinh) dien ((cuc te) or (cuc tieu))*.