Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
su triet » su viet, su tien, ve triet
thu sac » thu sach, thu san, thu xac
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
cac cam » cad cam, cac cap, cac cau
cam ban » can ban, cac ban, cam bay
hanh ki » hanh vi, hanh ky, hanh kien
sac ky » cac ky, sai ky
ki su » ky su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ky ((nang xa) or (trong cac)) hoi. hieu van cac cam ban hanh ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky ((nang xa) OR (trong cac)) hoi. hieu van cac cam ban hanh ki su triet.
• Adding a wildcard symbol may retrieve word variants: thu sac ky ((nang xa) or (trong cac)) hoi. hieu van cac cam ban hanh ki su triet*.