Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
dang xay » dang van, van xay
cam truc » cau truc, nam truc, lam truoc
tu sach » thu sach, su sach, te sach
hanh di » hanh de, hang di, danh di
truc va » thuc va, thuc vat, trung va
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
cuu tre » cua tre, cau tren, cau treo
ve cam » ve cham, ve cac, va cam

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 (thuoc sach)) ky dang xay hoi. hieu ve cam truc va ((hanh di) or (hanh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ky dang xay hoi. hieu ve cam truc va ((hanh di) OR (hanh vi)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ky dang xay hoi. hieu ve cam truc va ((hanh di) or (hanh vi)) cuu tre*.