Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam tu
va thanh » gia thanh, ban thanh, va tinh
sach ky » sach y, sach ty, sach kem
lang xa » lang ha, dang xay, lang van
tai cua » thai cua, tai cuc, tri cua
sac ky » cac ky, sai ky
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((sach ky) OR (sac ky)) lang xa hoi. hieu van ((nam thuc) or (nam thu)) va thanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((sach ky) OR (sac ky)) lang xa hoi. hieu van ((nam thuc) OR (nam thu)) va thanh tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((sach ky) OR (sac ky)) lang xa hoi. hieu van ((nam thuc) or (nam thu)) va thanh tai cua te".
• Adding a wildcard symbol may retrieve word variants: hoc ((sach ky) OR (sac ky)) lang xa hoi. hieu van ((nam thuc) or (nam thu)) va thanh tai cua te*.