Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
sach dai » sach dao, sach bai, sach dat
dai nang » da nang, dai dang, dai thang
thai cua » tai cuc, tri cua, dai cua
than cua » nhan cua, ban cua, gian cua
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
hoi cua » hoi chuc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach dai nang xa hoi. hieu va cac duc tan thanh ((((thai cua) OR (than cua))) or (hoi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach dai nang xa hoi. hieu va cac duc tan thanh ((((thai cua) OR (than cua))) OR (hoi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach dai nang xa hoi. hieu va cac duc tan thanh ((((thai cua) OR (than cua))) or (hoi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach dai nang xa hoi. hieu va cac duc tan thanh ((((thai cua) OR (than cua))) or (hoi cua)) tre*.