Perhaps you should try some spelling variations:
thien van » thi van
cua viet » ca viet, hoa viet, cua vat
thai son » thai den, thai do, thai hoc
tham soc » cham soc, tham nuoc, ham so
nang tai » hang tai, tang tai, sang tai
tai hoi » tai khoi, dai hoi, tai hai
vu sach » vu bach, su sach, vu khach
va hanh » van hanh, va thanh, va danh
te sach » toc sach
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (vu sach)) y nang tai hoi. thien van ((tham soc) OR (thai son)) va hanh vi cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (vu sach)) y nang tai hoi. thien van ((tham soc) OR (thai son)) va hanh vi cua viet~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (vu sach)) y nang tai hoi. thien van ((tham soc) OR (thai son)) va hanh vi cua viet*.