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