Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
duy sang » duy van, duy can, duy anh
cau tren » cu tren, dau tren, cau treo
dan sai » danh sai, doan sai, dan tai
van cam » van nam, van lam, van cau
ca tren » cu tren, la tren, co tren
lai hoa » dai hoa, loai hoc
va dan » ca dan, va dao, va dau
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((duy sang) or (ky nang)) lai hoa. thien van cam xuc va dan sai ((cau tren) OR (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((duy sang) OR (ky nang)) lai hoa. thien van cam xuc va dan sai ((cau tren) OR (ca tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((duy sang) or (ky nang)) lai hoa. thien van cam xuc va dan sai ((cau tren) OR (ca tren))".
• Adding a wildcard symbol may retrieve word variants: thu sach ((duy sang) or (ky nang)) lai hoa. thien van cam xuc va dan sai ((cau tren) OR (ca tren))*.