Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hang cau » hang dau, hang ca, nhung cau
hieu van » hieu va, thien van, lieu va
van chat » cao chat
va nang » van nang, da nang, cam nang
truc va » thuc vat, trung va
thuc va » thuc vat, thuc dan, thuc day
cau cua » cau qua, ca cua, cu cua
cua tre » cua te, cuu tre, cua triet
v nang » vu nang, van nang, voi 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 ((v nang) or (va nang)) xa hoi. hieu van chat ((truc va) OR (thuc va)) hang cau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((v nang) OR (va nang)) xa hoi. hieu van chat ((truc va) OR (thuc va)) hang cau cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((v nang) or (va nang)) xa hoi. hieu van chat ((truc va) OR (thuc va)) hang cau cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((v nang) or (va nang)) xa hoi. hieu van chat ((truc va) OR (thuc va)) hang cau cua tre*.