Perhaps you should try some spelling variations:
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
nang xa » nang x, lang xa, mang xa
cao luc » bao luc, cao duc, cao suc
nang ma » tang ma, sang ma, nang cao
sach ky » sac ky, sach y, sach ty
vi cua » vai cua, di cua
luc va » duc va, tuc va, loc va
ve cao » va cao, ve bao, ve cac
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((sach ky) or (cac ky)) ((nang xa) or (nang ma)) hoi. hieu ve cao luc va hanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ky) OR (cac ky)) ((nang xa) OR (nang ma)) hoi. hieu ve cao luc va hanh vi cua tu.
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ky) or (cac ky)) ((nang xa) or (nang ma)) hoi. hieu ve cao luc va hanh vi cua tu*.