Perhaps you should try some spelling variations:
sach thai » sach tham, sac thai, sach tai
thai tang » thai trang, thai bang, thai hang
thanh lap » thanh san, phan lap, thanh hai
va thanh » gia thanh, ban thanh, va tinh
co sach » bo sach, cuon sach, hoc sach
hieu vu » hieu va, hieu ve, hieu su
vu pham » su pham, vi pham, vu kham
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach thai tang ((ma hoa) or (xa hoi)). hieu vu pham duc va thanh lap ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach thai tang ((ma hoa) OR (xa hoi)). hieu vu pham duc va thanh lap ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: co sach thai tang ((ma hoa) or (xa hoi)). hieu vu pham duc va thanh lap ((cua tre) or (cua te))*.