Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
mai khoi » mai khoa, tai khoa, cac khoi
cua ngan » cua ban, vu ngan, cua dan
hang vai » hang va, hang tai, hang hai
cac tren » ca tren, cau tren, tac tren
rac tren » ran tren, tac tren, sach tren
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va nam » van nam, ha nam, va nay

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang ((mai khoi) or (ma hoa)). hieu va nam cua ngan hang vai ((cac tren) OR (rac tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((mai khoi) OR (ma hoa)). hieu va nam cua ngan hang vai ((cac tren) OR (rac tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((mai khoi) or (ma hoa)). hieu va nam cua ngan hang vai ((cac tren) OR (rac tren))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((mai khoi) or (ma hoa)). hieu va nam cua ngan hang vai ((cac tren) OR (rac tren))*.