Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
xuc tuan » duc thuan, quoc tuan, xuan tuan
tu nang » tru nang, tu nong, tu nano
cao hoc » co hoc, cho hoc, chat hoc
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
vi cua » vai cua
di cua » dai cua, doi cua, de 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) OR (toc sach)) tu nang cao hoc. hieu va cac xuc tuan anh ((vi cua) or (di cua)) chu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) tu nang cao hoc. hieu va cac xuc tuan anh ((vi cua) OR (di cua)) chu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) tu nang cao hoc. hieu va cac xuc tuan anh ((vi cua) or (di cua)) chu*".