Perhaps you should try some spelling variations:
nang xay » dang xay, nganh xay, nang xuan
xay phoi » cay phoi, cap phoi, tay hoi
hieu van » hieu va, thien van, lieu va
lang phi » lang phu, lang chai, lang ha
lanh hai » manh hai, thanh hai, lang chai
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
cao duc » dao duc, cao suc, giao duc
sach ky » sac ky, sach y, sach ty
cam duc » cam xuc, pham duc, nam duoc

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 nang xay phoi. hieu van ((cam duc) OR (cao duc)) ban ((lanh hai) or (lang phi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xay phoi. hieu van ((cam duc) OR (cao duc)) ban ((lanh hai) OR (lang phi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xay phoi. hieu van ((cam duc) OR (cao duc)) ban ((lanh hai) or (lang phi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xay phoi. hieu van ((cam duc) OR (cao duc)) ban ((lanh hai) or (lang phi)) cua tre*.