Perhaps you should try some spelling variations:
van nganh » van ngan, va nganh, vien nganh
sach thu » sach thue, sach thieu, sach tham
thu hang » thi hang, thuc hanh, thu huong
hang cau » hang dau, hang ca, nhung cau
chat xuc » chat huu, cam xuc, chao xu
dieu tra » dieu tri, kiem tra
te sach » toc sach
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
xuc van » duc van, luc van, vuc van

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 thu hang cau hoi. hieu va chat xuc van nganh ((dieu cua) OR (dieu tra)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu hang cau hoi. hieu va chat xuc van nganh ((dieu cua) OR (dieu tra)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach thu hang cau hoi. hieu va chat xuc van nganh ((dieu cua) OR (dieu tra)) tre*.