Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nham thu, pham thuc
sach bai » sach dao, cac bai, sach xa
bai hang » ban hang, bai tang, dai hang
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
hang xa » hoang xa, hang va, hang ca
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh

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