Perhaps you should try some spelling variations:
thuoc giai » thuc giai, thuoc giao, nuoc giai
tuong hieu » thuong hieu, trong hieu, guong hieu
hoc giai » hoc giao, hoc dai, so giai
sach tri » sach tren, sach truc, sach bai
sach tai » sach bai, sach tham, sach dao
thuc dan » thuc hanh, hoc dan, thuc vat
thu dau » thau dau, tu dau, phu dau

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 tri) OR (sach tai)) ((thu dau) or (thuc dan)) tuong hieu ((thuoc giai) or (hoc giai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tri) OR (sach tai)) ((thu dau) OR (thuc dan)) tuong hieu ((thuoc giai) OR (hoc giai)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tri) OR (sach tai)) ((thu dau) or (thuc dan)) tuong hieu ((thuoc giai) or (hoc giai))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tri) OR (sach tai)) ((thu dau) or (thuc dan)) tuong hieu ((thuoc giai) or (hoc giai))*.