Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
su triet » su viet, su tien, ve triet
sach cao » sach dao, sach cap, mach cao
cam thuc » am thuc, nam thuc, cam thu
hieu van » hieu va, thien van, lieu va
cao nang » cao dang, cam nang, cao tang
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
vi su » va su, ve su, ki su

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