Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
thien van » thi van
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, lieu va, hieu ve
sach thu » sach thue, sach thieu, sach tham
hang ca » hang va, nang cao, hang tai
sach ty » sach y, sach tu, xach tay
cac duc » cac du, cao duc, cac dac
vai cua » dai cua, hai cua, lai cua
cua tuc » cua duc, cua tu, cua thuoc
ca hoi » cau hoi, cua hoi, xa hoi

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 ty) OR (sach thu)) hang ca hoi. ((hieu van) or (thien van)) cac duc va thanh vai cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach thu)) hang ca hoi. ((hieu van) OR (thien van)) cac duc va thanh vai cua tuc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ty) OR (sach thu)) hang ca hoi. ((hieu van) or (thien van)) cac duc va thanh vai cua tuc".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) OR (sach thu)) hang ca hoi. ((hieu van) or (thien van)) cac duc va thanh vai cua tuc*.