Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tac, cac nuoc
va danh » va dinh, va dan, va hanh
danh ca » dan ca, doanh cua, danh cho
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
ma hoi » mai hoi, xa hoi, ma hoa
cac tu » cac thu, cach tu, cac du

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