Perhaps you should try some spelling variations:
bieu hien » dieu hien, dieu khien, bien phien
thu sach » tu sach, thuat sach, thuoc sach
toc sach » hoc sach, doc sach, thuoc sach
bach xuc » bach tuoc, bach xuan, bach qua
dau tren » dau tien, dat tren, dau tieng
nang xa » nang x, lang xa, nang ma
va hang » van hang, va nang, va lang
va dau » va dao

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