Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
hanh ky » hanh kem
sang ma » tang ma, nang ma, sang tao
van hau » van ha, van hai, van dau
danh vi » hanh vi, dinh vi, danh di
ma hoi » mai hoi, xa hoi, ma hoa
anh ky » anh y, anh my, nganh ky
luc va » tuc va, loc 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: hoc ((anh ky) OR (hanh ky)) sang ma hoi. hieu van hau ((luc va) or (duc va)) danh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((anh ky) OR (hanh ky)) sang ma hoi. hieu van hau ((luc va) OR (duc va)) danh vi cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((anh ky) OR (hanh ky)) sang ma hoi. hieu van hau ((luc va) or (duc va)) danh vi cau tren*".