Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh le » thinh le, thanh ve, thanh de
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
luc van » luoc van, luu van, duc van
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
le cua » ly cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc ((sach ky) or (sac ky)) nang xa hoi. hieu va cam ((luc van) or (cua ban)) thanh le cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc ((sach ky) OR (sac ky)) nang xa hoi. hieu va cam ((luc van) OR (cua ban)) thanh le cua triet.
• Adding a wildcard symbol may retrieve word variants: thuoc ((sach ky) or (sac ky)) nang xa hoi. hieu va cam ((luc van) or (cua ban)) thanh le cua triet*.