Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
cham duc » cham soc, pham duy, phan duc
van phan » van phong, van thanh, luan phan
phan lap » phan dau
nam viet » pham viet, lam viec, bac viet
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
lap nam » dap nam, lai nam, loai nam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty nang x ho. hieu van ((cham duc) or (pham duc)) van phan lap nam viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang x ho. hieu van ((cham duc) OR (pham duc)) van phan lap nam viet.
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang x ho. hieu van ((cham duc) or (pham duc)) van phan lap nam viet*.