Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hoc anh » hoc nganh, hoc nhanh, ngoc anh
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
anh ky » hanh ky, anh y, anh my
ma hoi » mai hoi, xa hoi, ma hoa
ve cau » ke cau, va cau, ve cac
luc va » tuc va, loc va
vi cau » va cau, di cau, viet cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc anh ky nang ma hoi. hieu ve cau ((luc va) or (duc va)) hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc anh ky nang ma hoi. hieu ve cau ((luc va) OR (duc va)) hanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: hoc anh ky nang ma hoi. hieu ve cau ((luc va) or (duc va)) hanh vi cau tren*.