Perhaps you should try some spelling variations:
tham loc » tham nuoc, cham soc, hau loc
thu sach » thuat sach, thuoc sach, thu hoach
sang mai » sang ma, sang tai, lang mai
tu sach » su sach, te sach, tu cach
cua tre » cuu tre, cua triet, dua tren
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
va tham » van tham, va cham, va thanh
mai hoi » mai khoi, dai hoi, lai hoi
loc va » hoc va, luc va
y sang » _ sang, duy sang
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: ((tu sach) or (thu sach)) y sang mai hoi. lieu va tham loc va danh vi ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y sang mai hoi. lieu va tham loc va danh vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) y sang mai hoi. lieu va tham loc va danh vi ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y sang mai hoi. lieu va tham loc va danh vi ((cua tre) OR (cua te))*.