Perhaps you should try some spelling variations:
thien van » thi van
sach thu » sach thue, sach thieu, sach tham
kinh de » kinh te, kinh do, kinh ve
va kinh » va tinh, qua kinh
cam luc » cam xuc, cau luc
cuu tre » cua tre, cau tren, cau treo
sach ty » sach y, sach tu, xach tay
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
luc va » duc va, tuc va, loc va
de cuu » de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((sach ty) or (sach thu)) lang xa hoi. ((hieu ve) or (thien van)) cam luc va kinh de cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((sach ty) OR (sach thu)) lang xa hoi. ((hieu ve) OR (thien van)) cam luc va kinh de cuu tre.
• Adding a wildcard symbol may retrieve word variants: doc ((sach ty) or (sach thu)) lang xa hoi. ((hieu ve) or (thien van)) cam luc va kinh de cuu tre*.