Perhaps you should try some spelling variations:
chan thuc » nhan thuc, can thuc, phan thuc
dang tay » dang xay, dung tay, dan tay
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
tu sach » thu sach, su sach, te sach
tay hoi » tay ho, tao hoi, tay thai
hieu va » lieu va, hieu qua
va chan » va phan, va chat, va cham
hanh ve » hanh vi, hanh va, hanh kem
cua tuc » cua duc, cua tu, cua thuoc
sach o » sach lo, sac o, sach y
o dang » xo dang, do dang, so dang
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 o dang tay hoi. hieu va chan thuc dan hanh ve ((cua te) or (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach o dang tay hoi. hieu va chan thuc dan hanh ve ((cua te) OR (cua tuc)).
• Adding a wildcard symbol may retrieve word variants: tu sach o dang tay hoi. hieu va chan thuc dan hanh ve ((cua te) or (cua tuc))*.