Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
dua tren » dung tren
tinh lap » trinh lap, tinh lao, dinh lap
nang tao » nang cao, sang tao, nang tai
va tinh » may tinh
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
va cham » va chat, va tham
sach ky » sac ky, sach y, sach kem
tao hoi » tao khoi, tao boi, tay hoi
sach ty » sach y, sach tu, sach thu
cua te » cua tu

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) or (sach ty)) nang tao hoi. hieu va cham thuc va tinh lap ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) nang tao hoi. hieu va cham thuc va tinh lap ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach ty)) nang tao hoi. hieu va cham thuc va tinh lap ((dua tren) or (cua te))*.