Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
te sach » toc sach
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
xuc van » duc van, luc van, vuc van
xuc ban » duc ban, cuc ban, quoc ban
luu tre » luu tru, cuu tre, luy tre
vi luu » vi lua

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 ((nang ma) OR (sang ma)) hoi. hieu qua cham ((xuc van) or (xuc ban)) hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang ma) OR (sang ma)) hoi. hieu qua cham ((xuc van) OR (xuc ban)) hanh vi luu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang ma) OR (sang ma)) hoi. hieu qua cham ((xuc van) or (xuc ban)) hanh vi luu tre*".