Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
luan hoc » luan hoan, quang hoc, luan khoa
tuan hoc » toan hoc, than hoc, quang hoc
nang tai » hang tai, tang tai, sang tai
te sach » toc sach
tai hoi » tai khoi, dai hoi, tai hai
vu sach » vu bach, su sach, vu khach
thi van » thi lan, thi hanh, thi nang
y nang » ky nang, ly nang, v nang
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
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. thi van ((tuan hoc) OR (luan hoc)) va dan 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. thi van ((tuan hoc) OR (luan hoc)) va dan vi cua viet~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (vu sach)) y nang tai hoi. thi van ((tuan hoc) OR (luan hoc)) va dan vi cua viet*.