Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi nang » thi cong, ki nang, thi hanh
nam thuc » nam thuoc, am thuc, nam thu
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
hieu ve » hieu van
hieu va » lieu va, hieu qua
hanh te » hanh tu, hanh ve, hanh de
te cua » tue cua, le cua, de cua
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. ((hieu ve) or (hieu va)) nam thuc dan hanh te cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi nang x hoi. ((hieu ve) OR (hieu va)) nam thuc dan hanh te cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach thi nang x hoi. ((hieu ve) or (hieu va)) nam thuc dan hanh te cua viet*.