Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
trinh dai » trinh tai, trinh di, trinh da
va trinh » van trinh, va tinh, lap trinh
cac loc » cac lop, cac toc, cac hoc
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, lai hoi
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
loc va » hoc va, luc va
cua te » cua tu

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 ((ty nang) or (ty hang)) mai hoi. hieu ve cac loc va trinh dai ((cua te) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty nang) OR (ty hang)) mai hoi. hieu ve cac loc va trinh dai ((cua te) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: su sach ((ty nang) or (ty hang)) mai hoi. hieu ve cac loc va trinh dai ((cua te) or (cua triet))*.