Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
lang xa » lang ha, dang xay, lang van
xuc van » duc van, luc van, vuc van
nam xuc » cam xuc, nam xua, nam thuc
cuu tre » cua tre, cau tren, cau treo
sach tu » sach thu, sach ty, sach uu
nang xa » nang x, nang ma, mang xa
cach tu » cach thuc
vi cuu » vi luu, vinh cuu

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

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