Perhaps you should try some spelling variations:
dinh toai » dinh toi, dinh tai, tinh toan
thien van » thi van
cham tuc » nham thuc, pham thuc, tham thuc
hieu van » hieu va, lieu va, hieu ve
hinh tai » chinh tai, hinh thai, hinh bai
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
y lang » o lang, _ lang, tay lang

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 y lang xa hoi. ((hieu van) OR (thien van)) cham tuc va ((dinh toai) or (hinh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y lang xa hoi. ((hieu van) OR (thien van)) cham tuc va ((dinh toai) OR (hinh tai)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y lang xa hoi. ((hieu van) OR (thien van)) cham tuc va ((dinh toai) or (hinh tai)) cua tre*".