Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
van hanh » ban hanh, van anh, van ban
bo sach » co sach, hoc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cua tu » cua tuc, cua su, cua cu
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: bo sach ty nang x hoi. hieu van pham duc ((van hanh) or (van thanh)) tai ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ty nang x hoi. hieu van pham duc ((van hanh) OR (van thanh)) tai ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: bo sach ty nang x hoi. hieu van pham duc ((van hanh) or (van thanh)) tai ((cua te) or (cua tu))*.