Perhaps you should try some spelling variations:
hang tai » hang va, dung tai
tai duc » tai cuc, mai duc, tai du
sach ky » sach y, sach ty, sach kem
duc tre » duoc tren, duc tien
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
luc va » duc va, tuc va
loc va » hoc va
sac ky » cac ky, sai ky
ve cau » ke cau, va cau, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) OR (sac ky)) dang xa hoi. hieu ve cau ((luc va) or (loc va)) hang tai duc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) dang xa hoi. hieu ve cau ((luc va) OR (loc va)) hang tai duc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sac ky)) dang xa hoi. hieu ve cau ((luc va) or (loc va)) hang tai duc tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sac ky)) dang xa hoi. hieu ve cau ((luc va) or (loc va)) hang tai duc tre*.