Perhaps you should try some spelling variations:
thuc day » thuc dan
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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 cao hoi. hieu ve cham ((thuc day) OR (thuc vat)) hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang cao hoi. hieu ve cham ((thuc day) OR (thuc vat)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cao hoi. hieu ve cham ((thuc day) OR (thuc vat)) hanh vi cua tre*.