Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
dau treo » dau tren, cau treo, dau tien
dau theo » cau theo, dai theo, dam theo
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc day
hanh va » hang va, hanh vi
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: su sach ky nang x hoi. hieu qua quan ((thuc va) or (thuc dan)) hanh va ((dau treo) OR (dau theo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu qua quan ((thuc va) OR (thuc dan)) hanh va ((dau treo) OR (dau theo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu qua quan ((thuc va) or (thuc dan)) hanh va ((dau treo) OR (dau theo))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu qua quan ((thuc va) or (thuc dan)) hanh va ((dau treo) OR (dau theo))*.