Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac nuoc
luc cua » luc chua, luc nua, tuc cua
cua dai » cua dan, cua dang
dai cuu » dai huu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) ky nang x hoi. hieu va cac luc cua dai ((dai cuu) OR (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang x hoi. hieu va cac luc cua dai ((dai cuu) OR (dai cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang x hoi. hieu va cac luc cua dai ((dai cuu) OR (dai cua)) tre*".