Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tinh bai » tinh bac, tinh hai, hinh bai
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
y nang » ky nang, ly nang, v nang
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
ca tre » ca tren, cua tre, ca tru
x hoi » xa hoi, o hoi, 5 hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach y nang ((x hoi) OR (x ho)). hieu ve cham ((luc va) or (tuc va)) tinh bai ca tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y nang ((x hoi) OR (x ho)). hieu ve cham ((luc va) OR (tuc va)) tinh bai ca tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y nang ((x hoi) OR (x ho)). hieu ve cham ((luc va) or (tuc va)) tinh bai ca tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang ((x hoi) OR (x ho)). hieu ve cham ((luc va) or (tuc va)) tinh bai ca tre*.