Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
nang ma » tang ma, sang ma, mang may
qua cam » qua cham, qua cac, qua ca
xuc van » duc van, luc van, thuc van
xuc ban » duc ban, cuc ban, quoc ban
vi cau » va cau, ve cau, di cau

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