Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
cam thuc » am thuc, nam thuc, cam thu
va danh » va dan, va hanh, dia danh
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va dinh » van dinh, va kinh, va tinh
tu sac » tu sach, tu cac, tu san
ve cam » ve cham, ve cac, va cam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) or (su sach)) ky nang xa hoi. hieu ve cam thuc ((va danh) OR (va dinh)) va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (su sach)) ky nang xa hoi. hieu ve cam thuc ((va danh) OR (va dinh)) va su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) or (su sach)) ky nang xa hoi. hieu ve cam thuc ((va danh) OR (va dinh)) va su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (su sach)) ky nang xa hoi. hieu ve cam thuc ((va danh) OR (va dinh)) va su triet*.