Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, lieu va, hieu ve
hang tai » hang va, dung tai
sach ty » sach y, sach tu, sach thu
cac duc » cac du, cao duc, cac dac
hang ca » hang va, nang cao, hang dau
vai cua » dai cua, hai cua, lai cua
cua tuc » cua duc, cua tu, cua thuoc

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 ((hang ca) OR (hang tai)) 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 ((hang ca) OR (hang tai)) 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 ((hang ca) OR (hang tai)) hoi. ((hieu van) or (thien van)) cac duc va thanh vai cua tuc".
• Adding a wildcard symbol may retrieve word variants: toc sach ty ((hang ca) OR (hang tai)) hoi. ((hieu van) or (thien van)) cac duc va thanh vai cua tuc*.