Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
hiem he » hiem xe, hieu he, thien he
sai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua
he nam » ha nam, nghe nam
thu va » thuc va, thue va, tu va
va dan » ca dan, va dao, va dau

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 (thu sach)) ky nang xa hoi. hiem he nam thu va dan ((sai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang xa hoi. hiem he nam thu va dan ((sai cua) OR (hai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky nang xa hoi. hiem he nam thu va dan ((sai cua) or (hai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky nang xa hoi. hiem he nam thu va dan ((sai cua) or (hai cua)) tre*.