Perhaps you should try some spelling variations:
thanh lay » thanh lap, thanh tay, thanh lam
va thanh » gia thanh, ban thanh, va tinh
nam thuc » nam thuoc, am thuc, nam thu
vu sach » vu bach, su sach, vu khach
cua tre » cuu tre, cua triet, dua tren
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, dam thuc
sach ky » sac ky, sach y, sach ty
cua te » cua tu
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang o hoi. hieu ve ((cam tuc) or (nam thuc)) va thanh lay ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang o hoi. hieu ve ((cam tuc) OR (nam thuc)) va thanh lay ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang o hoi. hieu ve ((cam tuc) or (nam thuc)) va thanh lay ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang o hoi. hieu ve ((cam tuc) or (nam thuc)) va thanh lay ((cua tre) OR (cua te))*.