Perhaps you should try some spelling variations:
quoc ban » quoc bao, quoc lan, quoc quan
ve cham » va cham, ve chat, vu cham
danh tu » anh tu, doanh thu
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
hoc bao » hoc cao, hoc bai, hoc bo
tu cua » hu cua, vu cua
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) or (sach ty)) nang ma hoi. hieu ve cham ((quoc ban) or (hoc bao)) danh tu cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sach ty)) nang ma hoi. hieu ve cham ((quoc ban) OR (hoc bao)) danh tu cua te.
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (sach ty)) nang ma hoi. hieu ve cham ((quoc ban) or (hoc bao)) danh tu cua te*.