Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach ty, sach kem
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
luu tre » cuu tre, luy tre
tru » truc

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) or (sach y)) nang cao hoi. hieu va cac xuc van hanh vi ((luu tre) OR (luu tru))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang cao hoi. hieu va cac xuc van hanh vi ((luu tre) OR (luu tru)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach y)) nang cao hoi. hieu va cac xuc van hanh vi ((luu tre) OR (luu tru))".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach y)) nang cao hoi. hieu va cac xuc van hanh vi ((luu tre) OR (luu tru))*.