Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
doc sach » hoc sach, toc sach, nuoc sach
qua cham » qua cac, va cham, qua cua
dung sai » dung tai, dung va, dung dat
va dung » van dung, va duong, vat dung
qua hai » qua hoat
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
xuc va » duc va, tuc va, luc va
cua tu » cua tuc, cua su, cua cu

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

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