Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh van » thanh san, thanh toan, thanh phan
thu sach » tu sach, thuoc sach, thu hoach
van cua » vang cua, ban cua, dan cua
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (thuat sach)) ly nang xa hoi. hieu va cam ((xuc va) OR (luc va)) thanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) ly nang xa hoi. hieu va cam ((xuc va) OR (luc va)) thanh van cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thuat sach)) ly nang xa hoi. hieu va cam ((xuc va) OR (luc va)) thanh van cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuat sach)) ly nang xa hoi. hieu va cam ((xuc va) OR (luc va)) thanh van cua tre*.