Perhaps you should try some spelling variations:
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham loc » cham soc, chon loc, cham o
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
hai cua » thai cua, hoi cua, lai cua
sach ky » sac ky, sach y, sach ty
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
va dan » ca dan, va dao, va dau

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 ky dang xay hoi. hieu van cham loc ((va hanh) or (va dan)) ((dai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xay hoi. hieu van cham loc ((va hanh) OR (va dan)) ((dai cua) OR (hai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xay hoi. hieu van cham loc ((va hanh) or (va dan)) ((dai cua) or (hai cua)) tre*.