Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
ky dang » ky danh
hieu ve » hieu va, hieu van
cau luc » cau truc, cau phuc
cuc tre » duc tre, cua tre, cuu tre
ve cau » ke cau, va cau, ve cac
luc va » duc va, tuc va, loc va

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) or (su sach)) ((ky dang) OR (ky nang)) cau hoi. hieu ve cau luc va thanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ((ky dang) OR (ky nang)) cau hoi. hieu ve cau luc va thanh tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ((ky dang) OR (ky nang)) cau hoi. hieu ve cau luc va thanh tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ((ky dang) OR (ky nang)) cau hoi. hieu ve cau luc va thanh tai cuc tre*.