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
thuc va » thuc vat, thuc dan, thuc day
cuc tre » cua tre, cuu tre, cuc thue
van tai » von tai, van tuan
han tai » hang tai, nhan tai, toan tai
te sach » toc sach
sach ky » sac ky, sach y, sach ty
va tham » van tham, va cham, va thanh
hieu va » lieu va, hieu qua
ky dang » ky nang, ky danh
duc tre » duoc tren, duc tien

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky dang bai choi. hieu va tham thuc va ((han tai) or (van tai)) ((cuc tre) OR (duc tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang bai choi. hieu va tham thuc va ((han tai) OR (van tai)) ((cuc tre) OR (duc tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang bai choi. hieu va tham thuc va ((han tai) or (van tai)) ((cuc tre) OR (duc tre))".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang bai choi. hieu va tham thuc va ((han tai) or (van tai)) ((cuc tre) OR (duc tre))*.