Perhaps you should try some spelling variations:
tam viet » nam viet, cam viet, tam biet
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
cham duc » pham duc, pham duy, phan duc
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
lai tam » lai cam, lai nam, lai tap
te sach » toc sach
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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 ty nang ((x hoi) OR (o hoi)). hieu van ((cham duc) or (cham soc)) van hanh lai tam viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((x hoi) OR (o hoi)). hieu van ((cham duc) OR (cham soc)) van hanh lai tam viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ((x hoi) OR (o hoi)). hieu van ((cham duc) or (cham soc)) van hanh lai tam viet*".