Perhaps you should try some spelling variations:
thanh ve » hanh ve, thanh va, thanh vien
thuc dan » thuc hanh, hoc dan, thuc vat
thuc va » thuc vat, thuc day
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
va pham » van pham, va phat, va phap
lang ha » long ha
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
ve cua » le cua, de cua, te 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 ky ((nang xa) or (lang ha)) hoi. lieu va pham ((thuc va) OR (thuc dan)) thanh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (lang ha)) hoi. lieu va pham ((thuc va) OR (thuc dan)) thanh ve cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) or (lang ha)) hoi. lieu va pham ((thuc va) OR (thuc dan)) thanh ve cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (lang ha)) hoi. lieu va pham ((thuc va) OR (thuc dan)) thanh ve cua tre*.