Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
te sach » toc sach
va hanh » van hanh, va thanh, va danh
lang xa » dang xay, lang van
lang ha » long ha
hieu va » lieu va, hieu qua
xuc va » duc va, tuc va, luc va
va cam » va cham, va cac, va cao
vi va » vi van, vai va, vu va
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thu sach)) ky ((lang xa) OR (lang ha)) hoi. hieu va cam xuc va hanh vi va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ky ((lang xa) OR (lang ha)) hoi. hieu va cam xuc va hanh vi va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thu sach)) ky ((lang xa) OR (lang ha)) hoi. hieu va cam xuc va hanh vi va thiet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) ky ((lang xa) OR (lang ha)) hoi. hieu va cam xuc va hanh vi va thiet*.