Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, phan duc
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
sach thu » sach thue, sach thieu, sach tham
hieu van » hieu va, thien van, lieu va
pham duy » pham duc
lai cua » dai cua, hai cua, lai chau
sach ty » sach y, sach tu, xach tay
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 ty) or (sach thu)) nang x hoi. hieu van ((cham duc) or (pham duy)) van hanh lai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) nang x hoi. hieu van ((cham duc) OR (pham duy)) van hanh lai cua vat.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thu)) nang x hoi. hieu van ((cham duc) or (pham duy)) van hanh lai cua vat*.