Perhaps you should try some spelling variations:
thai day » thai tay, thai dac, thai doan
sach ky » sac ky, sach ty, sach kem
day dau » day du, day sau, dan dau
hieu va » lieu va, hieu qua
su tien » su kien, su hien, tu tieng
hieu ve » hieu van
lang xa » lang ha, dang xay, lang van
dau vi » dau ve, dau va, dat vi
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) or (sach y)) lang xa hoi. ((hieu ve) OR (hieu va)) chat thai day dau vi su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) lang xa hoi. ((hieu ve) OR (hieu va)) chat thai day dau vi su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach y)) lang xa hoi. ((hieu ve) OR (hieu va)) chat thai day dau vi su tien".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach y)) lang xa hoi. ((hieu ve) OR (hieu va)) chat thai day dau vi su tien*.