Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van thanh » ban thanh, van tuan
cau tren » cu tren, dau tren, ca tren
thanh di » thanh doi, thanh de, thanh do
sach tu » sach thu, cach tu, sach ty
luc van » luoc van, luu van, duc van
so sach » so sanh, bo sach, co sach
lang xa » lang ha, dang xay, lang van
nang ma » tang ma, sang ma, nang cao
cam luc » cam xuc, cau luc
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach tu ((nang ma) or (lang xa)) hoi. lieu va cam luc van thanh di ((cua triet) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tu ((nang ma) OR (lang xa)) hoi. lieu va cam luc van thanh di ((cua triet) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: so sach tu ((nang ma) or (lang xa)) hoi. lieu va cam luc van thanh di ((cua triet) or (cau tren))*.