Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
thu sach » tu sach, thuat sach, thuoc sach
thanh di » thanh de, thanh do, thanh dinh
cau tren » cu tren, dau tren, ca tren
cua viet » ca viet, hoa viet, cua vat
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty nang x hoi. hieu ve pham duc va ((thanh di) OR (thanh doi)) ((cau tren) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang x hoi. hieu ve pham duc va ((thanh di) OR (thanh doi)) ((cau tren) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang x hoi. hieu ve pham duc va ((thanh di) OR (thanh doi)) ((cau tren) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang x hoi. hieu ve pham duc va ((thanh di) OR (thanh doi)) ((cau tren) or (cua viet))*.