Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
dua tren » dung tren
sach ly » sach y, sach lo, sach ty
ly vang » ly hang, ly van, ly quang
ma hanh » va hanh, da hanh, na hanh
hanh va » hang va, hanh vi
cuu tre » cua tre, cau tren, cau treo
vang x » nang x
thu ma » thuc ma, thu ha, tu ma
x hoi » xa hoi, o hoi, x ho

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 ly vang x hoi. hieu van nam thu ma hanh va ((cuu tre) or (dua tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ly vang x hoi. hieu van nam thu ma hanh va ((cuu tre) OR (dua tren)).
• Adding a wildcard symbol may retrieve word variants: thu sach ly vang x hoi. hieu van nam thu ma hanh va ((cuu tre) or (dua tren))*.