Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
te sach » toc sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
van hoc » van hoa
duc van » duc tan, duc manh, duc phan
ma hoi » xa hoi, ma hoa, me hoi
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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 ky nang ((ma hoi) OR (mai hoi)). hieu van hoc ((duc van) or (duc va)) hanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((ma hoi) OR (mai hoi)). hieu van hoc ((duc van) OR (duc va)) hanh vi cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((ma hoi) OR (mai hoi)). hieu van hoc ((duc van) or (duc va)) hanh vi cua tu*".