Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van chat » cao chat
xang dau » hang dau
thuc va » thuc vat, thuc dan, thuc day
danh tu » anh tu, doanh thu
cuu tre » cua tre, cau tren, cau treo
truc va » thuc vat, trung va
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang

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 y nang xa hoi. hieu van chat ((truc va) OR (thuc va)) ((xang dau) or (danh tu)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang xa hoi. hieu van chat ((truc va) OR (thuc va)) ((xang dau) OR (danh tu)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang xa hoi. hieu van chat ((truc va) OR (thuc va)) ((xang dau) or (danh tu)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang xa hoi. hieu van chat ((truc va) OR (thuc va)) ((xang dau) or (danh tu)) cuu tre*.