Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
hang tai » dung tai
hanh tai » thanh tai, han tai, hinh tai
sach tai » sach bai, sach tham, sach dao
so sach » so sanh, bo sach, co sach
thuc xa » thuc xay, tuc xa, thuc va
va tham » van tham, va cham, va thanh
hieu va » lieu va, hieu qua
hang xa » hoang xa, hang ca, lang xa
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach tai ((hang xa) OR (hang va)) hoi. hieu va tham thuc xa ((hanh tai) or (hang tai)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tai ((hang xa) OR (hang va)) hoi. hieu va tham thuc xa ((hanh tai) OR (hang tai)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach tai ((hang xa) OR (hang va)) hoi. hieu va tham thuc xa ((hanh tai) or (hang tai)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: so sach tai ((hang xa) OR (hang va)) hoi. hieu va tham thuc xa ((hanh tai) or (hang tai)) cuu tre*.