Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
quoc ban » quoc bao, quoc lan, quoc quan
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
sach ty » sach y, sach tu, sach thu
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, dua tren
te sach » toc sach
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang ma hoi. hieu ve cham ((quoc ban) or (duc van)) hanh vi ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ma hoi. hieu ve cham ((quoc ban) OR (duc van)) hanh vi ((cua tre) OR (cua triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ma hoi. hieu ve cham ((quoc ban) or (duc van)) hanh vi ((cua tre) OR (cua triet))*".