Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
tham doc » than doc, tham do, tham nuoc
cua viet » ca viet, hoa viet, cua dieu
te sach » toc sach
vu sach » vu bach, su sach, vu khach
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
doc va » duoc va, hoc va, duc va

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