Perhaps you should try some spelling variations:
te sach » toc sach
va hanh » van hanh, va thanh, va danh
sang ma » tang ma, nang ma, sang tao
hieu va » lieu va, hieu qua
dau luc » cau luc, dau luan, dau nuoc
y sang » _ sang, duy sang
va dau » va dao
ma hoi » mai hoi, xa hoi, ma hoa
cua tu » cua tuc, cua su, cua cu

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 y sang ma hoi. hieu va dau luc ((va hanh) or (may tinh)) di ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y sang ma hoi. hieu va dau luc ((va hanh) OR (may tinh)) di ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: te sach y sang ma hoi. hieu va dau luc ((va hanh) or (may tinh)) di ((cua te) or (cua tu))*.