Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
luu van » cuu van, luan van, luu hanh
ky lang » ky nang, ky dang, ky tang
hoa hoi » khoa hoi, hoa hoc, hoa doi
hanh de » hanh ve, hanh kem
hieu ve » hieu va, hieu van
cau luu » cau luc
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ve cau » ke cau, va cau, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky lang ((hoa hoi) or (ha noi)). hieu ve cau luu van ((hanh de) or (hanh vi)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky lang ((hoa hoi) OR (ha noi)). hieu ve cau luu van ((hanh de) OR (hanh vi)) su triet.
• Adding a wildcard symbol may retrieve word variants: te sac ky lang ((hoa hoi) or (ha noi)). hieu ve cau luu van ((hanh de) or (hanh vi)) su triet*.