Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
duc ban » duc tan, duc van, dua ban
san cuu » san cua, san huu, song cuu
cuu tre » cua tre, cau tren, cau treo

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 ty nang xa hoi. ((hieu van) or (hieu va)) cam ((duc ban) or (duc va)) thanh san cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. ((hieu van) OR (hieu va)) cam ((duc ban) OR (duc va)) thanh san cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. ((hieu van) or (hieu va)) cam ((duc ban) or (duc va)) thanh san cuu tre*.