Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hang tai » hang va, dung tai
hanh tai » thanh tai, han tai, hinh tai
cham duc » pham duc, cham soc, pham duy
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
sach ky » sac ky, sach y, sach ty
duc van » duc va, duc tan, duc manh
nang ma » tang ma, sang ma, nang cao
su sach » so sach, vu sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((nang ma) or (nang x)) hoi. hieu ve cham duc van ((hanh tai) or (hang tai)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang ma) OR (nang x)) hoi. hieu ve cham duc van ((hanh tai) OR (hang tai)) cua triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang ma) or (nang x)) hoi. hieu ve cham duc van ((hanh tai) or (hang tai)) cua triet*.