Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
va hanh » van hanh, va thanh, va danh
su tien » su hien, tu tieng, dau tien
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
va cam » va cham, va cac, va cao
ve cam » ve cham, ve cac, ve cai
x hoi » xa hoi, o hoi, x ho
kien » bien, vien, dien

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang x hoi. hieu ((ve cam) or (va cam)) thuc va hanh tai ((su tien) OR (su kien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. hieu ((ve cam) OR (va cam)) thuc va hanh tai ((su tien) OR (su kien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. hieu ((ve cam) or (va cam)) thuc va hanh tai ((su tien) OR (su kien))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu ((ve cam) or (va cam)) thuc va hanh tai ((su tien) OR (su kien))*.