Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh hai » thanh hai, nhanh hai, hang hai
thuc day » thuc dan, thuc vat
hai cuu » hai cua, hai chu, hai cuc
truc va » thuc va, thuc vat, trung va
van cau » van dau, van hau, van chat
sach ky » sac ky, sach y, sach kem
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) OR (sach ty)) nang xa hoi. hieu van cau ((truc va) or (thuc day)) hanh hai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach ty)) nang xa hoi. hieu van cau ((truc va) OR (thuc day)) hanh hai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sach ty)) nang xa hoi. hieu van cau ((truc va) or (thuc day)) hanh hai cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) OR (sach ty)) nang xa hoi. hieu van cau ((truc va) or (thuc day)) hanh hai cuu tre*.