Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
so sanh » do sanh
nang ma » tang ma, sang ma, mang may
hieu ve » hieu va, hieu van
sanh y » sinh y, anh y, hanh y
ve cam » ve cham, ve cac, va cam
xuc va » tuc va, luc va, xac va
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: so sanh y ((nang ma) or (nang cao)) hoi. hieu ve cam ((xuc va) or (duc va)) hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh y ((nang ma) OR (nang cao)) hoi. hieu ve cam ((xuc va) OR (duc va)) hanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: so sanh y ((nang ma) or (nang cao)) hoi. hieu ve cam ((xuc va) or (duc va)) hanh vi cau tren*.