Perhaps you should try some spelling variations:
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
sach ky » sac ky, sach ty, sach kem
luu tre » luu tru, cuu tre, luy tre
nang xa » nang x, lang xa, mang xa
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
vi luu » vi lua

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