Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van hanh » van thanh, ban hanh, van anh
cham xuc » cam xuc, chat xuc, cham soc
va hanh » va thanh, va danh, ban hanh
va cham » va chat, va tham
hieu va » lieu va, hieu qua
lang ha » long ha
lang xa » dang xay, lang van
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 y ((lang xa) or (lang ha)) hoi. hieu va cham xuc ((va hanh) OR (van hanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y ((lang xa) OR (lang ha)) hoi. hieu va cham xuc ((va hanh) OR (van hanh)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y ((lang xa) or (lang ha)) hoi. hieu va cham xuc ((va hanh) OR (van hanh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach y ((lang xa) or (lang ha)) hoi. hieu va cham xuc ((va hanh) OR (van hanh)) dai cua tre*.