Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
sach thi » sach thu, sach tai, sach thieu
thi hang » thi hanh, thi nang, thi hong
cuu tre » cua tre, cau treo
va hanh » van hanh, va thanh, va danh
bao luc » bao thuc
tu sach » thu sach, su sach, te sach
cau luc » cau truc, cau phuc
hang co » hang cho, hang ca, nang co
co hoi » co hoc, co loi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thi hang co hoi. hieu qua ((cau luc) or (bao luc)) va hanh vi ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi hang co hoi. hieu qua ((cau luc) OR (bao luc)) va hanh vi ((cuu tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach thi hang co hoi. hieu qua ((cau luc) or (bao luc)) va hanh vi ((cuu tre) or (cau tren))*.