Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
thi hanh » thi thanh
cua viet » hoa viet, cua vat, cua dieu
thi nang » thi cong, ki nang
hanh tai » thanh tai, hang tai, han tai
dan hanh » dang hanh, dan khanh, dan thanh
cam thuc » am thuc, nam thuc, cam thu
tu sach » thu sach, su sach, te sach
ca viet » va viet, co viet, hoa viet
ca hoi » cau hoi, cua hoi, xa hoi
va cam » va cham, va cac, va cao

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 ((thi hanh) or (thi nang)) ca hoi. lieu va cam thuc dan hanh tai ((cua viet) OR (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((thi hanh) OR (thi nang)) ca hoi. lieu va cam thuc dan hanh tai ((cua viet) OR (ca viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((thi hanh) or (thi nang)) ca hoi. lieu va cam thuc dan hanh tai ((cua viet) OR (ca viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((thi hanh) or (thi nang)) ca hoi. lieu va cam thuc dan hanh tai ((cua viet) OR (ca viet))*.