Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
su tien » su hien, tu tieng, dau tien
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
va cham » va chat, va tham
sach ky » sac ky, sach y, sach ty
ve cam » ve cham, ve cac, va cam
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 cham)) 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 cham)) 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 cham)) thuc va hanh tai ((su tien) or (su kien))*.