Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tinh bai » tinh bac, tinh hai, hinh bai
nhan luc » nang luc
cua tre » cua te, cua triet, dua tren
va tinh » may tinh
sach ky » sac ky, sach y, sach ty
va nhan » van nhan, ca nhan, va phan
hieu va » lieu va, hieu qua
lang ha » long ha
lang xa » dang xay, lang van
cuu tre » cau tren, cau treo
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: thuoc sach ky ((lang xa) OR (lang ha)) hoi. hieu va nhan luc va tinh bai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky ((lang xa) OR (lang ha)) hoi. hieu va nhan luc va tinh bai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky ((lang xa) OR (lang ha)) hoi. hieu va nhan luc va tinh bai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky ((lang xa) OR (lang ha)) hoi. hieu va nhan luc va tinh bai ((cua tre) or (cuu tre))*.