Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
thuc hoa » thuc khoa, thuc hoat, thuc ha
hoa lang » hoa dan, hoa van
dieu cua » dieu tra
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
de cua » le cua, te cua

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 xa hoi. hieu va cac thuc hoa lang ((de cua) OR (dieu cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu va cac thuc hoa lang ((de cua) OR (dieu cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu va cac thuc hoa lang ((de cua) OR (dieu cua)) tre*.