Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
nang mai » nang ma, nang tai, lang mai
qua pham » quan pham, quy pham, qua cham
mai hoi » mai khoi, dai hoi, lai hoi
va cua » va chua, via cua, ca cua
cua te » cua tu

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) or (thuoc sach)) ky nang mai hoi. hieu qua pham duc ((va tinh) OR (may tinh)) va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) ky nang mai hoi. hieu qua pham duc ((va tinh) OR (may tinh)) va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thuoc sach)) ky nang mai hoi. hieu qua pham duc ((va tinh) OR (may tinh)) va cua te".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuoc sach)) ky nang mai hoi. hieu qua pham duc ((va tinh) OR (may tinh)) va cua te*.