Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, lieu va, hieu ve
thuc day » thuc dan, thuc vat
hanh hai » thanh hai, nhanh hai, hang hai
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
truc va » thuc va, thuc vat, trung va
hai cuu » hai cua, hai chu, hai cuc
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 nang xa hoi. ((hieu van) OR (thien 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 nang xa hoi. ((hieu van) OR (thien 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 nang xa hoi. ((hieu van) OR (thien van)) cau ((truc va) or (thuc day)) hanh hai cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. ((hieu van) OR (thien van)) cau ((truc va) or (thuc day)) hanh hai cuu tre*.