Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
va nhanh » va hanh, va nhan, va nganh
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
ban xuc » ban xu, ban duoc, ban phuc
cuu tre » cua tre, cau tren, cau treo
co hoi » co hoc, co loi
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
ha cuu » ho cuu, cham cuu, khao cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((y nang) or (v nang)) co hoi. hieu van ban xuc ((va nhanh) OR (va thanh)) ha cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (v nang)) co hoi. hieu van ban xuc ((va nhanh) OR (va thanh)) ha cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) or (v nang)) co hoi. hieu van ban xuc ((va nhanh) OR (va thanh)) ha cuu tre*".