Perhaps you should try some spelling variations:
hien bach » vien bach, thien hach, hien hanh
hieu hien » bieu hien, dieu hien, chieu chien
bach tuoc » sach duoc, sach nuoc
toc sach » hoc sach, doc sach, thuoc sach
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
tuoc va » thuoc va, nuoc va, duoc va
va hang » van hang, va nang, va lang
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren

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 (toc sach)) ky nang xa hoi. hieu hien bach tuoc va hang va ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky nang xa hoi. hieu hien bach tuoc va hang va ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (toc sach)) ky nang xa hoi. hieu hien bach tuoc va hang va ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky nang xa hoi. hieu hien bach tuoc va hang va ((cuu tre) OR (cua tre))*.