Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
cac phuc » cau phuc, khac phuc, cac thu
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang ha » nang hai, nang han, nang hoa
hieu ve » hieu va, hieu van
cam dan » cac dan, ca dan, nam dan
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi
dan va » doan va, dan ca, ban va
va cua » va chua, via cua, ca cua

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 nang ha hoi. hieu ve ((cac phuc) or (cach thuc)) cam dan va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ha hoi. hieu ve ((cac phuc) OR (cach thuc)) cam dan va cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ha hoi. hieu ve ((cac phuc) or (cach thuc)) cam dan va cua tre*.