Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
tinh doi » trinh doc, trinh do, tinh hoc
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van hac » van hoc, van ha, van hai
van bac » van ban, van bao, dan bac
truc va » thuc va, trung va
doi cua » dai cua, hoi cua
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: thuat sach ky nang xa hoi. hieu ((van hac) or (van bac)) ((truc va) or (thuc vat)) tinh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang xa hoi. hieu ((van hac) OR (van bac)) ((truc va) OR (thuc vat)) tinh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang xa hoi. hieu ((van hac) or (van bac)) ((truc va) or (thuc vat)) tinh doi cua tre*.