Perhaps you should try some spelling variations:
sach thien » sach thieu, sach tien, cach thien
thien quan » trien quang, lien quan, thien van
luan hoi » luat hoi, luan hoc, luan doi
te sach » toc sach
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
xuc va » tuc va, luc va, xac va
vi cua » vai cua, di cua

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 thien quan luan hoi. hieu va cam ((xuc va) OR (duc va)) hanh vi cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thien quan luan hoi. hieu va cam ((xuc va) OR (duc va)) hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: te sach thien quan luan hoi. hieu va cam ((xuc va) OR (duc va)) hanh vi cua vat*.