Perhaps you should try some spelling variations:
lam truoc » lam thuoc, nam truoc, lam truong
ban hanh » ban hang
toan ky » than ky, toan ly, toan ke
va danh » va dinh, va dan, va hanh
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, mang xa
va lam » van lam, va lap
vi hoa » voi hoa, vi hoc, va hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat toan ky ((nang xa) OR (nang ma)) hoi. hieu va lam truoc ((ban hanh) or (va danh)) vi hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat toan ky ((nang xa) OR (nang ma)) hoi. hieu va lam truoc ((ban hanh) OR (va danh)) vi hoa viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat toan ky ((nang xa) OR (nang ma)) hoi. hieu va lam truoc ((ban hanh) or (va danh)) vi hoa viet".
• Adding a wildcard symbol may retrieve word variants: thuat toan ky ((nang xa) OR (nang ma)) hoi. hieu va lam truoc ((ban hanh) or (va danh)) vi hoa viet*.