Perhaps you should try some spelling variations:
thien van » thi van
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
van cham » van chat, van tham, va cham
cham tuc » nham thuc, pham thuc, tham thuc
nang xa » nang x, lang xa, nang ma
tuc van » thuc van, truc van, tuc va
dau cua » day cua, cau cua, dan cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (hoc sach)) ky nang xa hoi. thien van cham tuc van dich ((dau cua) OR (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ky nang xa hoi. thien van cham tuc van dich ((dau cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (hoc sach)) ky nang xa hoi. thien van cham tuc van dich ((dau cua) OR (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) ky nang xa hoi. thien van cham tuc van dich ((dau cua) OR (dai cua)) tre*.