Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
sang mai » sang ma, sang tai, lang mai
cham loc » cham soc, chon loc, cham o
tu sach » su sach, te sach, tu cach
danh vi » dinh vi, danh di, danh va
va cham » va chat, va tham
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, dai hoi, lai hoi
loc va » hoc va, luc va
y sang » _ sang, duy sang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) y sang mai hoi. lieu va cham loc va ((danh vi) OR (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y sang mai hoi. lieu va cham loc va ((danh vi) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) y sang mai hoi. lieu va cham loc va ((danh vi) OR (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y sang mai hoi. lieu va cham loc va ((danh vi) OR (hanh vi)) cua tre*.