Perhaps you should try some spelling variations:
nhung cau » chung cu, nhung bai, nhu cau
toc sach » hoc sach, doc sach, thuoc sach
my nhung » ky nhung, ma nhung, me nhung
hieu van » hieu va, thien van, lieu va
tuan xuc » quang xuc, tuan khuc, tue xuc
toan xac » toan hoc, toan ban, toan tap
phan lap » phan dau
sach my » sach y, sach ty, sach mau
va phan » van phan, va phat, va phap
lap cua » lai cua, tap cua, lam cua
cua tre » cua te, cuu tre, cua triet

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 my nhung cau hoi. hieu van ((tuan xuc) OR (toan xac)) va phan lap cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach my nhung cau hoi. hieu van ((tuan xuc) OR (toan xac)) va phan lap cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach my nhung cau hoi. hieu van ((tuan xuc) OR (toan xac)) va phan lap cua tre*.