Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh de » hanh ve, hanh kem
luc van » luoc van, luu van, duc van
sach ky » sac ky, sach y, sach kem
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
ke cau » ket cau
de cua » le cua, te cua, dieu cua
ve cau » va cau, ve cac, le cau

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