Perhaps you should try some spelling variations:
chua tre » chua tri, chua trieu, cho tre
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach kem
hanh va » hang va, hanh vi
duc van » duc va, duc tan, duc manh
cau duc » cao duc, cau luc, chu duc
van cau » van dau, van hau, van chat
thi van » thi lan, thi hanh, thi nang
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
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 cau duc van hanh va ((chua tre) OR (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 cau duc van hanh va ((chua tre) OR (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 cau duc van hanh va ((chua tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach ty)) nang x hoi. thi van cau duc van hanh va ((chua tre) OR (cua tre))*.