Perhaps you should try some spelling variations:
dung tren » dung trong, dung trung
va triet » va thiet, va trien, ve triet
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
cau cua » cau qua, ca cua, cu cua
hieu ke » hieu kem, chieu ke, hieu ky
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
dan vai » dan tai, dan vat, den vai
ke cau » ket cau
dan va » doan va, dan ca, ban va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty lang xa hoi. hieu ke cau cua ban ((dan vai) or (dan va)) ((dung tren) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty lang xa hoi. hieu ke cau cua ban ((dan vai) OR (dan va)) ((dung tren) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty lang xa hoi. hieu ke cau cua ban ((dan vai) or (dan va)) ((dung tren) or (va triet))*.