Perhaps you should try some spelling variations:
tinh vai » tinh va, tinh hai, tinh bai
dang xay » dang van, van xay
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
ban tinh » ban thanh, quan tinh, ban hanh
su sach » so sach, vu sach
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
cac cua » cach cua, cac qua, ca cua
cua tu » cua tuc, cua su, cua cu

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 ky dang xay hoi. hieu ve ((cac nuoc) or (cac cua)) ban tinh vai ((cua tre) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xay hoi. hieu ve ((cac nuoc) OR (cac cua)) ban tinh vai ((cua tre) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xay hoi. hieu ve ((cac nuoc) or (cac cua)) ban tinh vai ((cua tre) or (cua tu))*.