Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
hoc sach » hoc sinh, hoc anh
hanh via » hanh vi, hanh va, anh va
van hanh » van thanh, ban hanh, van anh
via cuu » via cua, vinh cuu
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
cuu tre » cua tre, cau tren, cau treo
nang xa » nang x, lang xa, nang ma
hoc cac » hoc cao
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sach) or (hoc cac)) v nang xa hoi. ((hieu qua) or (hieu quan)) cam duc van hanh via cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc cac)) v nang xa hoi. ((hieu qua) OR (hieu quan)) cam duc van hanh via cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (hoc cac)) v nang xa hoi. ((hieu qua) or (hieu quan)) cam duc van hanh via cuu tre*.