Perhaps you should try some spelling variations:
thanh dan » thanh san, thanh van, thanh dat
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
dan cua » dan ca, ban cua, dai cua
cua tre » cua te, cuu tre, cua triet
tang ma » mang may, tang van
y tang » ky tang, 6 tang, 7 tang
nam lo » nam bo, nam so, nam co
ma hoi » mai hoi, xa hoi, ma hoa
cam 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 y tang ma hoi. hieu van ((cham h'roi) or (((cam lo) OR (nam lo)))) va thanh dan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y tang ma hoi. hieu van ((cham h'roi) OR (((cam lo) OR (nam lo)))) va thanh dan cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y tang ma hoi. hieu van ((cham h'roi) or (((cam lo) OR (nam lo)))) va thanh dan cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y tang ma hoi. hieu van ((cham h'roi) or (((cam lo) OR (nam lo)))) va thanh dan cua tre*.