Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach kem
hanh ca » hanh cac, hanh cat, hanh cua
duc van » duc va, duc tan, duc manh
cau duc » cao duc, cau luc, chu duc
thi lan » thi hanh, thi nang, thi lien
cua tre » cua te, cuu tre, cua triet
thi van » thi hanh, thi nang
sach ty » sach y, sach tu, sach thu
ca cua » co cua
x hoi » xa hoi, o hoi, x ho

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 ky) or (sach ty)) nang x hoi. ((thi van) OR (thi lan)) cau duc van hanh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach ty)) nang x hoi. ((thi van) OR (thi lan)) cau duc van hanh ca cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach ty)) nang x hoi. ((thi van) OR (thi lan)) cau duc van hanh ca cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach ty)) nang x hoi. ((thi van) OR (thi lan)) cau duc van hanh ca cua tre*.