Perhaps you should try some spelling variations:
dang thai » dang thi, dang hai, dang khai
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham buc » cham soc, pham duc, cham cuu
thai cua » than cua, tai cuc, tri cua
so sach » so sanh, bo sach, co sach
ty hang » ty xang, thi hang, thu hang
ly hang » ly quang
mai hoi » mai khoi, dai hoi, lai hoi
xa dang » xa dong, da dang, xo dang
buc xa » tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((ty hang) or (ly hang)) mai hoi. hieu van cham buc xa dang thai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ty hang) OR (ly hang)) mai hoi. hieu van cham buc xa dang thai cua vat.
• Adding a wildcard symbol may retrieve word variants: so sach ((ty hang) or (ly hang)) mai hoi. hieu van cham buc xa dang thai cua vat*.