Perhaps you should try some spelling variations:
thu nang » thi nang, thu bang, tho nang
hung doi » huong doi, nhung doi, dung doi
thu hang » thi hang, thuc hanh, thu huong
su sach » so sach, vu sach
doi cua » dai cua, hoi cua
ta hung » tai hung, tu hung, ba hung
cac toc » cac toi, cac nuoc, cac thoi
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ve cac » va cac, vien cac
ma hoi » xa hoi, ma hoa, me hoi
toc ta » toc tay, toc thai
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: su sach ((thu nang) or (thu hang)) ((ma hoi) OR (mai hoi)). hieu ve cac toc ta hung doi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((thu nang) OR (thu hang)) ((ma hoi) OR (mai hoi)). hieu ve cac toc ta hung doi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((thu nang) or (thu hang)) ((ma hoi) OR (mai hoi)). hieu ve cac toc ta hung doi cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ((thu nang) or (thu hang)) ((ma hoi) OR (mai hoi)). hieu ve cac toc ta hung doi cua te*.