Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
hieu cao » chieu cao, hieu cac, hieu ca
danh dai » danh dau, danh di, danh sai
sach ky » sac ky, sach ty, sach kem
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, duc va

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

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