Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
hanh dai » hanh tai, hanh dao, vanh dai
ban hanh » ban hang
xuc ban » duc ban, cuc ban, quoc ban
cua tre » cua te, cuu tre, cua triet
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam

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 ky) OR (sac ky)) nang xa hoi. hieu ((ve cam) or (vien cac)) xuc ban hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang xa hoi. hieu ((ve cam) OR (vien cac)) xuc ban hanh dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac ky)) nang xa hoi. hieu ((ve cam) or (vien cac)) xuc ban hanh dai cua tre*".