Perhaps you should try some spelling variations:
sang tao » hang tai
truc va » thuc va, thuc vat, trung va
dang de » dang deo, dung de, dang do
danh de » hanh de, dan de, danh di
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
van bac » van ban, van bao, van hac
tao hoa » bao hoa, tao hoi, tao ho
ky sang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet

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 sang tao hoa. hieu ((van bac) or (van hoa)) truc va ((danh de) OR (dang de)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang tao hoa. hieu ((van bac) OR (van hoa)) truc va ((danh de) OR (dang de)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky sang tao hoa. hieu ((van bac) or (van hoa)) truc va ((danh de) OR (dang de)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang tao hoa. hieu ((van bac) or (van hoa)) truc va ((danh de) OR (dang de)) cua tre*.