Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van cham » van chat, van tham, va cham
van phan » van phong, van thanh, luan phan
cham duc » pham duc, cham soc, pham duy
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
lap nam » dap nam, loai nam
lai nam » loai nam, mai nam, dai nam
hai nam » ha nam, loai nam
duc van » duc va, duc tan, duc manh
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: thu sach ty nang x hoi. hieu van cham duc van phan ((lap nam) or (((lai nam) OR (hai nam)))) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang x hoi. hieu van cham duc van phan ((lap nam) OR (((lai nam) OR (hai nam)))) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang x hoi. hieu van cham duc van phan ((lap nam) or (((lai nam) OR (hai nam)))) viet".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang x hoi. hieu van cham duc van phan ((lap nam) or (((lai nam) OR (hai nam)))) viet*.