Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va doanh » van doanh, vay doanh, hoa doanh
pham day » phap day, pham duy, pham xay
cau treo » cau theo, cau tren, cau triet
thu nang » thi nang, thu bang, tho nang
thu hang » thi hang, thuc hanh, thu huong
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, va hanh
van cau » van dau, van hau, van chat
ve pham » vi pham, v pham, ve phan

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 ((thu nang) or (thu hang)) xa hoi. hieu ve pham day ((va doanh) or (va danh)) van cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((thu nang) OR (thu hang)) xa hoi. hieu ve pham day ((va doanh) OR (va danh)) van cau treo.
• Adding a wildcard symbol may retrieve word variants: thu sach ((thu nang) or (thu hang)) xa hoi. hieu ve pham day ((va doanh) or (va danh)) van cau treo*.