Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
van nham » van nam, van nhan, van tham
toc sach » doc sach, thuoc sach, nuoc sach
tinh vai » tinh va, tinh hai, tinh bai
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
vai cua » dai cua, hai cua, lai cua
va tinh » may tinh
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

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) or (((toc sach) OR (hoc sach)))) ky nang xa hoi. hieu van nham thuc va tinh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (((toc sach) OR (hoc sach)))) ky nang xa hoi. hieu van nham thuc va tinh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (((toc sach) OR (hoc sach)))) ky nang xa hoi. hieu van nham thuc va tinh vai cua tre*".