Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
cua viet » ca viet, cua vat, cua dieu
hanh vai » hanh vi, hanh tai, hanh van
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
sach thi » sach thu, sach tai, sach thieu
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
hanh va » hang va, hanh vi
hanh xa » hanh ma, hanh xu, canh xa
ve nam » he nam, va nam, le nam

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