Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
cam thuc » am thuc, cam thu, can thuc
cao nang » cao dang, cam nang, cao tang
nam thuc » nam thuoc, am thuc, nam thu
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
da nang » cam nang, kha nang
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 ((da nang) OR (cao nang)) xa hoi. hieu ve ((cam thuc) or (nam thuc)) va danh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((da nang) OR (cao nang)) xa hoi. hieu ve ((cam thuc) OR (nam thuc)) va danh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((da nang) OR (cao nang)) xa hoi. hieu ve ((cam thuc) or (nam thuc)) va danh vi su triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((da nang) OR (cao nang)) xa hoi. hieu ve ((cam thuc) or (nam thuc)) va danh vi su triet*.