Perhaps you should try some spelling variations:
sach thien » sach thieu, sach tien, cach thien
thien lang » thien bang, thien dang, thien nang
dua tren » dung tren
hieu van » hieu va, thien van, lieu va
thanh va » thanh van, hanh va, thanh ha
su sach » so sach, vu sach
cuu tre » cua tre, cau tren, cau treo
van lam » van nam
lang xa » lang ha, dang xay, lang van
tuc va » thuc va, truc va, duc va

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