Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh ve » hanh vi, hanh va, hanh kem
hanh te » hanh tu, hanh de, hanh he
cuu hoc » cua hoc, cuu thuoc, cuu khoa
van cuu » van cau, van chu, van cu
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sach y)) nang xa hoi. hieu van cuu hoc dan ((hanh te) OR (hanh ve)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang xa hoi. hieu van cuu hoc dan ((hanh te) OR (hanh ve)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach y)) nang xa hoi. hieu van cuu hoc dan ((hanh te) OR (hanh ve)) cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang xa hoi. hieu van cuu hoc dan ((hanh te) OR (hanh ve)) cua te*.