Perhaps you should try some spelling variations:
hac truc » hoc truc, hang truc, sach truc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cuu tre » cua tre, cau tren, cau treo
ca tren » cau tren, cu tren, la tren
va hac » van hac, va khac, va cac
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 ky nang x hoi. hieu va hac truc va danh vi ((cuu tre) or (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu va hac truc va danh vi ((cuu tre) OR (ca tren))*.