Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
qua cham » qua hai, qua cac, va cham
toc sach » hoc sach, doc sach, thuoc sach
thu bang » thu ban, thu hang, chu bang
thu nang » thi nang, thu hang, tho nang
truc va » thuc va, thuc vat, trung va
hang vi » hang va, hanh vi, khang voi
hang di » hang doi, hang dien, hang dich
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 ((thu nang) OR (thu bang)) xa hoi. hieu qua cham truc va ((hang vi) or (hang di)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((thu nang) OR (thu bang)) xa hoi. hieu qua cham truc va ((hang vi) OR (hang di)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((thu nang) OR (thu bang)) xa hoi. hieu qua cham truc va ((hang vi) or (hang di)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ((thu nang) OR (thu bang)) xa hoi. hieu qua cham truc va ((hang vi) or (hang di)) cua tre*.