Perhaps you should try some spelling variations:
nam thuc » nam thuoc, nam thu, nam tu
hanh cua » manh cua, hanh sua, doanh cua
hang cua » mang cua, hang ca, huong cua
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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 v nang xa hoi. hieu ve ((nam thuc) or (am thuc)) va ((hanh cua) OR (hang cua)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang xa hoi. hieu ve ((nam thuc) OR (am thuc)) va ((hanh cua) OR (hang cua)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang xa hoi. hieu ve ((nam thuc) or (am thuc)) va ((hanh cua) OR (hang cua)) cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach v nang xa hoi. hieu ve ((nam thuc) or (am thuc)) va ((hanh cua) OR (hang cua)) cua viet*.