Perhaps you should try some spelling variations:
kham tuc » nham thuc, pham thuc, kham cuoc
te sach » toc sach
cau cua » cau qua, ca cua, cu cua
sach ky » sac ky, sach y, sach ty
hieu vu » hieu va, hieu ve, hieu su
vu kham » vu khanh
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
cua tre » cua te, cuu tre, cua triet
va dat » va dao, va dau, va dai
va dap » va dao, va dau

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

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