Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hinh bai » hinh tai, hinh thai, tinh bac
tinh bai » tinh bac, tinh hai, tinh bao
cham luc » cham soc, nhan luc, cham cuu
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va

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) or (lang xa)) hoi. hieu ve cham luc va ((tinh bai) OR (hinh bai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((nang xa) OR (lang xa)) hoi. hieu ve cham luc va ((tinh bai) OR (hinh bai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky ((nang xa) or (lang xa)) hoi. hieu ve cham luc va ((tinh bai) OR (hinh bai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((nang xa) or (lang xa)) hoi. hieu ve cham luc va ((tinh bai) OR (hinh bai)) cua tre*.