Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
xay tinh » may tinh, xa tinh, tay tinh
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
cau tuc » cau truc, cau tu, cau luc
tuc xay » thuc xay, tuc xa, tu xay
tinh di » tinh doi, trinh di, tinh da
cua tre » cua te, cuu tre, dua tren

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 x ho. ((hieu ve) or (hieu qua)) cau tuc xay tinh di ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang x ho. ((hieu ve) OR (hieu qua)) cau tuc xay tinh di ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: su sach ty nang x ho. ((hieu ve) or (hieu qua)) cau tuc xay tinh di ((cua tre) or (cua triet))*.