Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam tu
va thanh » gia thanh, ban thanh, va tinh
thanh ve » hanh ve, thanh va, thanh vien
tu sach » thu sach, su sach, te sach
hieu he » hieu ve, hiem he, hieu le
luu tre » luu tru, cuu tre, luy tre
ve luu » ke luu, vi luu
x hoi » xa hoi, o hoi, x ho

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) or (thu hoach)) ky nang x hoi. hieu he ((nam thuc) OR (nam thu)) va thanh ve luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ky nang x hoi. hieu he ((nam thuc) OR (nam thu)) va thanh ve luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu hoach)) ky nang x hoi. hieu he ((nam thuc) OR (nam thu)) va thanh ve luu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ky nang x hoi. hieu he ((nam thuc) OR (nam thu)) va thanh ve luu tre*.