Perhaps you should try some spelling variations:
dang thi » hoang thi, dang khoi
tu sach » thu sach, te sach, tu cach
thi cua » thai cua, thi cuc, tri cua
va dang » van dang, va nang, va lang
cac tac » cac bac, cac dac, cac tai
cac toc » cac toi, cac nuoc, cac thoi
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang

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 (su sach)) y lang xa hoi. hieu va ((cac toc) or (cac tac)) va dang thi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) y lang xa hoi. hieu va ((cac toc) OR (cac tac)) va dang thi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) y lang xa hoi. hieu va ((cac toc) or (cac tac)) va dang thi cua tre*.