Perhaps you should try some spelling variations:
sach thien » sach thieu, sach tien, cach thien
thien nang » thien bang, thien dang, trien nang
dua tren » dung tren
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
cuu tre » cua tre, cau tren, cau treo
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, nang ma
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa

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 thien nang xa hoi. hieu van cam ((xuc va) OR (tuc va)) hanh vi ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thien nang xa hoi. hieu van cam ((xuc va) OR (tuc va)) hanh vi ((dua tren) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thien nang xa hoi. hieu van cam ((xuc va) OR (tuc va)) hanh vi ((dua tren) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: su sach thien nang xa hoi. hieu van cam ((xuc va) OR (tuc va)) hanh vi ((dua tren) or (cuu tre))*.