Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
sach tu » sach thu, sach ty, sach uu
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
nang xa » lang xa, nang ma, mang xa
cach tu » cach thuc
va cuu » va cau, va chu, va huu
cac o » cac co, cac bo, cac ho
o va » do va, so va, co va

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 (nang x)) hoi. hieu vien cac o va hanh va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (cach tu)) ((nang xa) OR (nang x)) hoi. hieu vien cac o va hanh va cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) or (cach tu)) ((nang xa) or (nang x)) hoi. hieu vien cac o va hanh va cuu tre*.