Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
hang tai » hang va, dung tai
hieu van » hieu va, thien van, lieu va
tai hoi » tai khoi, dai hoi, tai hai
sach ty » sach y, sach thu, xach tay
sach tu » sach thu, cach tu, sach uu
van bao » van ban, van dao
vai cua » dai cua, hai cua, lai cua
cua duc » cua tuc, cua nuoc, cua quoc
dau va » dau ve, lau va
du va » tu va, su va, vu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach tu) OR (sach ty)) hang tai hoi. hieu van bao ((du va) or (dau va)) thanh vai cua duc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach tu) OR (sach ty)) hang tai hoi. hieu van bao ((du va) OR (dau va)) thanh vai cua duc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach tu) OR (sach ty)) hang tai hoi. hieu van bao ((du va) or (dau va)) thanh vai cua duc".
• Adding a wildcard symbol may retrieve word variants: toc ((sach tu) OR (sach ty)) hang tai hoi. hieu van bao ((du va) or (dau va)) thanh vai cua duc*.