Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh dai » thanh hai, thanh tai, thanh dat
cau tren » cu tren, dau tren, ca tren
lang xa » dang xay, lang van
lang ha » long ha
hieu va » lieu va, hieu qua
dai cau » dat cau, da cau, dai hau
va cam » va cham, va cac, va cao
xuc va » tuc va, luc va, xac 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 y ((lang xa) or (lang ha)) hoi. hieu va cam ((xuc va) OR (duc va)) thanh dai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y ((lang xa) OR (lang ha)) hoi. hieu va cam ((xuc va) OR (duc va)) thanh dai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y ((lang xa) or (lang ha)) hoi. hieu va cam ((xuc va) OR (duc va)) thanh dai cau tren".
• Adding a wildcard symbol may retrieve word variants: thuat sach y ((lang xa) or (lang ha)) hoi. hieu va cam ((xuc va) OR (duc va)) thanh dai cau tren*.