Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu hanh » du hanh, lu hanh, thuc hanh
hanh xa » hanh va, hanh ma, hanh xu
qua lam » cua lam, qua la, qua lao
lam xuc » cam xuc, lam duoc
xuc ban » duc ban, cuc ban, quoc ban
cua tre » cuu tre, cua triet, dua tren
anh vi » hanh vi, anh ve, anh vu
anh va » hanh va
cua te » cua tu

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 tu hanh xa hoi. hieu qua lam xuc ban ((anh vi) or (anh va)) ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu hanh xa hoi. hieu qua lam xuc ban ((anh vi) OR (anh va)) ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu sach tu hanh xa hoi. hieu qua lam xuc ban ((anh vi) or (anh va)) ((cua tre) or (cua te))*.