Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
tinh van » trinh van, dinh van, tinh va
va tham » van tham, va thanh, va thuat
van cau » van dau, van hau, van chat
va tinh » may tinh
va cham » va chat
lang xa » lang ha, dang xay, lang van
cau tre » cau tren, cau treo, cau tra
o lang » hoa lang, hoi lang

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)) o lang xa hoi. hieu ((va cham) or (va tham)) duc va tinh van cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) o lang xa hoi. hieu ((va cham) OR (va tham)) duc va tinh van cau tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuoc sach)) o lang xa hoi. hieu ((va cham) or (va tham)) duc va tinh van cau tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuoc sach)) o lang xa hoi. hieu ((va cham) or (va tham)) duc va tinh van cau tre*.