Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
trinh dai » trinh tai, trinh di, trinh da
nang mai » nang ma, nang tai, lang mai
va trinh » van trinh, va tinh, lap trinh
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ty nang » ky nang, ty xang, ty hang
cac luc » cau luc, cac nuoc, cac cuoc
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 mai hoi. hieu ve ((cac luc) OR (coc luc)) 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 mai hoi. hieu ve ((cac luc) OR (coc luc)) va trinh dai ((cua te) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang mai hoi. hieu ve ((cac luc) OR (coc luc)) va trinh dai ((cua te) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang mai hoi. hieu ve ((cac luc) OR (coc luc)) va trinh dai ((cua te) or (cua triet))*.