Perhaps you should try some spelling variations:
thanh gian » thanh giang, thach giang, thanh san
gian cua » gian xu, ban cua
hoc sach » hoc sinh, hoc cac, hoc anh
va thanh » gia thanh, ban thanh, va tinh
dang mau » dong mau, dang van, dang su
cam thuc » am thuc, nam thuc, cam thu
dang nam » dong nam, dan nam, dung nam
te sach » toc sach
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (hoc sach)) ky ((dang mau) or (dang nam)) hoi. hieu va cam thuc va thanh gian cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (hoc sach)) ky ((dang mau) OR (dang nam)) hoi. hieu va cam thuc va thanh gian cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (hoc sach)) ky ((dang mau) or (dang nam)) hoi. hieu va cam thuc va thanh gian cua tre*.