Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
ha thuc » va thuc, ha thuy, ha thu
cua tre » cua te, cuu tre, dua tren
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
ha tuc » va tuc, ha duc, thai tuc
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: su sach ky nang ma hoi. hieu van ((ha tuc) OR (ha thuc)) va hanh tai ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoi. hieu van ((ha tuc) OR (ha thuc)) va hanh tai ((cua tre) OR (cua triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ma hoi. hieu van ((ha tuc) OR (ha thuc)) va hanh tai ((cua tre) or (cua triet))*".