Perhaps you should try some spelling variations:
thuc van » thuc vat, thuc va, thuc hanh
sach thi » sach thu, sach tai, sach thieu
thi nang » thi cong, ki nang, thi hanh
thuc dan » thuc hanh, thuc vat
hanh va » hang va, hanh vi
su sach » so sach, vu sach
va tham » van tham, va cham, va thanh
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
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) OR (hoc dan)))) hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thi nang xa hoi. hieu va tham ((thuc van) OR (((thuc dan) OR (hoc 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) OR (hoc 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) OR (hoc dan)))) hanh va cua tre*.