Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
trinh cua » tinh cua, trinh luat, trinh quan
sinh cua » manh cua, dinh cuu, sinh va
cong san » cong tac
cham nen » cham den, cham nhin, cham ninh
chan nan » chan nhan, chang nang, chan doan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sach - hanh ((trinh cua) or (sinh cua)) nhung cong san ((cham nen) or (chan nan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh ((trinh cua) OR (sinh cua)) nhung cong san ((cham nen) OR (chan nan)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh ((trinh cua) or (sinh cua)) nhung cong san ((cham nen) or (chan nan))*.