Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tinh vai » tinh va, tinh hai, tinh bai
cau tren » cu tren, dau tren, ca tren
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
van cam » van lam, van cau, van dam
va tinh » may tinh
vai cau » va cau, van cau, vai cac
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 sach) or (thuoc sach)) ky nang ma hoi. thien ((van cam) OR (van nam)) tu va tinh vai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (thuoc sach)) ky nang ma hoi. thien ((van cam) OR (van nam)) tu va tinh vai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (thuoc sach)) ky nang ma hoi. thien ((van cam) OR (van nam)) tu va tinh vai cau tren".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (thuoc sach)) ky nang ma hoi. thien ((van cam) OR (van nam)) tu va tinh vai cau tren*.