Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
ban nuoc » ban duoc, ban nuoi, ban thuoc
con viet » cong viet, co viet, mon viet
nang ma » tang ma, sang ma, nang cao
va danh » va dinh, va dan, va hanh
va tinh » may tinh
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
vi con » vit con, voi con, va con

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang ma hoi. hieu van ban nuoc ((va danh) or (((ban thanh) or (va tinh)))) vi con viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ma hoi. hieu van ban nuoc ((va danh) OR (((ban thanh) OR (va tinh)))) vi con viet.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ma hoi. hieu van ban nuoc ((va danh) or (((ban thanh) or (va tinh)))) vi con viet*.