Perhaps you should try some spelling variations:
hanh vinh » thanh vinh, khanh vinh, hanh tinh
vinh cua » sinh cua, tinh cua, dinh cua
sach ky » sac ky, sach ty, sach kem
va cham » va chat, va tham
hieu va » lieu va, hieu qua
nang co » nang cao, nang doc, nang noi
cua tre » cua te, cuu tre, cua triet
co hoi » co hoc, co loi
tuc va » thuc va, truc va, tuc xa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) OR (sach y)) nang co hoi. hieu va cham ((tuc va) or (thuc vat)) hanh vinh cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang co hoi. hieu va cham ((tuc va) OR (thuc vat)) hanh vinh cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sach y)) nang co hoi. hieu va cham ((tuc va) or (thuc vat)) hanh vinh cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sach y)) nang co hoi. hieu va cham ((tuc va) or (thuc vat)) hanh vinh cua tre*.