Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh de » hanh ve, hanh kem
loc van » luoc van, hoc van, lo van
hau loc » huu loc, phau hoc
sach ky » sac ky, sach y, sach kem
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
de cua » le cua, te cua, dieu cua

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) or (lieu va)) hau loc 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) OR (lieu va)) hau loc van hanh de cua tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach ty)) nang xa hoi. ((hieu ve) or (lieu va)) hau loc van hanh de cua tre*.