Perhaps you should try some spelling variations:
manh thanh » danh thanh, minh thanh, manh thang
thanh lap » thanh san, phan lap, thanh hai
thuc manh » thuc hanh, thuc thanh, thuc dan
nam thuc » nam thuoc, am thuc, nam thu
sach thu » sach thue, sach thieu, sach tham
dang xay » dang van, van xay
cua tre » cuu tre, cua triet, dua tren
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, xach tay
xay hoi » xa hoi, tay hoi, cay phoi
va nam » van nam, ha nam, va nay
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: su ((sach ty) or (sach thu)) dang xay hoi. hieu va nam thuc manh thanh lap ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach thu)) dang xay hoi. hieu va nam thuc manh thanh lap ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach thu)) dang xay hoi. hieu va nam thuc manh thanh lap ((cua tre) or (cua te))*.