Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
vat hanh » vat thanh, van hanh, va hanh
cau tren » cu tren, ca tren, cau treo
dau tren » dau tien, dat tren, dau tieng
co sach » bo sach, cuon sach, hoc sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va nham » va cham, va tham, va nha
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: co sach ky nang x hoi. hieu va nham thuc vat hanh va ((cau tren) OR (dau tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ky nang x hoi. hieu va nham thuc vat hanh va ((cau tren) OR (dau tren))".
• Adding a wildcard symbol may retrieve word variants: co sach ky nang x hoi. hieu va nham thuc vat hanh va ((cau tren) OR (dau tren))*.