Perhaps you should try some spelling variations:
nhung tuong » nhung huong, nhung phuong, hung vuong
thieu tach » thien hach, chiet tach, chieu sach
hoc thieu » toc thieu, hoc hien
trinh vat » trinh van, trinh luat, sinh vat
tuong dan » huong dan, tung dan, xuong dan
trinh va » trinh van, trinh ve, trinh vi
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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 tach - hanh ((trinh va) or (trinh vat)) nhung tuong dan ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tach - hanh ((trinh va) OR (trinh vat)) nhung tuong dan ((toan cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu tach - hanh ((trinh va) or (trinh vat)) nhung tuong dan ((toan cau) or (toan tap))*.