Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
gia hanh » gia thanh, giao hanh, gia anh
toc sach » hoc sach, doc sach, thuoc sach
nang mai » nang ma, nang tai, lang mai
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, dua tren
cam tuc » cam tu, nam thuc, dam thuc

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty nang mai hoi. hieu ve ((cam tuc) OR (cam xuc)) gia hanh vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang mai hoi. hieu ve ((cam tuc) OR (cam xuc)) gia hanh vi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang mai hoi. hieu ve ((cam tuc) OR (cam xuc)) gia hanh vi ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang mai hoi. hieu ve ((cam tuc) OR (cam xuc)) gia hanh vi ((cua tre) or (cua triet))*.