Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
thieu khi » thieu nhi, tien khi, hieu chi
nhung bo » nhung bai, nhung don, trung bo
nhung bi » nhung bai, nhung gi
tu sach » thu sach, su sach, te sach
khi cua » chi cua, thai cua
doc vi » hoc vi, don vi, doc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu hoach)) hoa hoc thieu khi cua ets : ((nhung bo) OR (nhung bi)) doc vi đai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) hoa hoc thieu khi cua ets : ((nhung bo) OR (nhung bi)) doc vi đai*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu hoach)) hoa hoc thieu khi cua ets : ((nhung bo) OR (nhung bi)) doc vi đai*".