Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
va thanh » gia thanh, ban thanh, va tinh
va tieng » va tinh, tu tieng, va thong
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va hanh » van hanh, va danh, ban hanh
ve nam » he nam, va nam, le nam
thiet » thieu

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