Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nang doi » nang doc, nang noi, hang doi
doi cua » dai cua, hoi cua
sach ky » sac ky, sach y, sach kem
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, sach thu
tuc da » tuc dan, tac da, tuc va
ve cac » va cac, vien cac

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 ky) or (sach ty)) lang xa hoi. hieu ve cac ((tuc da) OR (tuc xa)) nang doi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) lang xa hoi. hieu ve cac ((tuc da) OR (tuc xa)) nang doi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach ty)) lang xa hoi. hieu ve cac ((tuc da) OR (tuc xa)) nang doi cua triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach ty)) lang xa hoi. hieu ve cac ((tuc da) OR (tuc xa)) nang doi cua triet*.