Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi nang » thi cong, ki nang, thi hanh
thuc van » thuc vat, thuc va, thuc hanh
thuc dan » thuc hanh, hoc dan, thuc vat
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach thi nang xa hoi. hieu va tham ((thuc van) OR (thuc dan)) hanh va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thi nang xa hoi. hieu va tham ((thuc van) OR (thuc dan)) hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach thi nang xa hoi. hieu va tham ((thuc van) OR (thuc dan)) hanh va cua tre*.