Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
su sach » so sach, vu sach
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
ve cham » va cham, ve chat, vu cham
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
cau tre » cau tren, cau treo, cau tra
ma hoi » mai hoi, xa hoi, ma hoa
ve cai » va cai, ve cac, ve tai
di cau » da cau, diem cau

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 (thuoc sach)) ky tang ma hoi. hieu ((ve cai) or (ve cham)) duc va hanh di cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thuoc sach)) ky tang ma hoi. hieu ((ve cai) OR (ve cham)) duc va hanh di cau tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thuoc sach)) ky tang ma hoi. hieu ((ve cai) or (ve cham)) duc va hanh di cau tre*.