Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
hieu van » hieu va, thien van, lieu va
phat duc » phan duc, phan duoc, pham duy
van hanh » van thanh, ban hanh, van anh
so sach » so sanh, bo sach, co sach
ty nang » ky nang, ty xang, ty hang
sach ty » sach y, sach tu, sach thu
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: so sach ty nang x hoi. hieu van ((phat duc) OR (pham duc)) van hanh tai ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang x hoi. hieu van ((phat duc) OR (pham duc)) van hanh tai ((cua te) OR (cua tu))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang x hoi. hieu van ((phat duc) OR (pham duc)) van hanh tai ((cua te) or (cua tu))*".