Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
dai tren » dat tren, dau tren, dan tren
lang ha » long ha
duc van » duc va, duc tan, duc manh
vuc van » luc van, thuc van, chuc van
lang xa » dang xay, lang van
hieu va » lieu va, hieu qua
va cau » van cau, va cac, va dau
vi dai » si dai, li dai, vien dai

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 cau ((duc van) or (vuc van)) hanh vi dai 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 cau ((duc van) OR (vuc van)) hanh vi dai tren.
• Adding a wildcard symbol may retrieve word variants: thuat sach y ((lang xa) or (lang ha)) hoi. hieu va cau ((duc van) or (vuc van)) hanh vi dai tren*.