Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
hieu van » hieu va, thien van, lieu va
may hoi » may thoi, tay hoi, mai hoi
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
sach 6 » sach 2
cam lo » nam lo, cam ly, cam o

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach 6) OR (sach y)) mang may hoi. hieu van ((cham h'roi) or (cam lo)) gia thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach 6) OR (sach y)) mang may hoi. hieu van ((cham h'roi) OR (cam lo)) gia thanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach 6) OR (sach y)) mang may hoi. hieu van ((cham h'roi) or (cam lo)) gia thanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach 6) OR (sach y)) mang may hoi. hieu van ((cham h'roi) or (cam lo)) gia thanh tai cua tre*.