Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
dang bai » dung bai, dang hai, dang ba
bai choi » tai chi, bai hoc, bi cho
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
thuc va » thuc vat, thuc dan, thuc day
han tai » hang tai, nhan tai, toan tai
van tai » von tai, van tuan
cuc tre » duc tre, cua tre, cuu tre

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 ky dang bai choi. hieu va tham thuc va ((han tai) or (van tai)) cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang bai choi. hieu va tham thuc va ((han tai) OR (van tai)) cuc tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang bai choi. hieu va tham thuc va ((han tai) or (van tai)) cuc tre*.