Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
thi van » thi lan, thi hanh, thi nang
va kinh » va tinh, qua kinh
kinh de » kinh te, kinh do, kinh ve
cua tre » cuu tre, cua triet, dua tren
y lang » o lang, _ lang, tay lang
xuc va » duc va, tuc va, luc va
cua te » cua tu

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 y lang xa hoi. ((hieu ve) or (thi van)) cam xuc va kinh de ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach y lang xa hoi. ((hieu ve) OR (thi van)) cam xuc va kinh de ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: doc sach y lang xa hoi. ((hieu ve) or (thi van)) cam xuc va kinh de ((cua tre) or (cua te))*.