Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
hanh di » hanh vi, hang di, danh di
hanh de » hanh ve, hanh kem
cau tu » dau tu, cau truc
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: tu sach ky nang x hoi. hieu van cau tu va ((hanh di) or (hanh de)) cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu van cau tu va ((hanh di) OR (hanh de)) cua vat*.