Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
xac dung » xay dung, tac dung, sach dung
tu cach » tu cac
cao hoi » cau hoi, co hoi, cao hoc
hieu he » hieu ve, hiem he, hieu le
thu xac » thau xay
sai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua
he nam » ha nam, nghe nam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (thu sach)) ky nang cao hoi. hieu he nam thu xac dung ((sai cua) OR (hai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) ky nang cao hoi. hieu he nam thu xac dung ((sai cua) OR (hai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thu sach)) ky nang cao hoi. hieu he nam thu xac dung ((sai cua) OR (hai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) ky nang cao hoi. hieu he nam thu xac dung ((sai cua) OR (hai cua)) triet*.