Perhaps you should try some spelling variations:
van tuan » van quan, van ban, anh tuan
cuu nong » cuu cong, cuu nang, cuu tong
tu sach » thu sach, su sach, te sach
cau luc » cau truc, cau phuc
hai cua » thai cua, hoi cua, lai cua
luc van » luoc van, luu van, duc van
hieu va » lieu va, hieu qua
uu nang » cuu nang, vu nang, dun nang
va cau » van cau, va cac, va dau

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 ((uu nang) or (cuu nong)) xa hoi. hieu va cau luc van tuan ((hai cua) OR (dai cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((uu nang) OR (cuu nong)) xa hoi. hieu va cau luc van tuan ((hai cua) OR (dai cua)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((uu nang) or (cuu nong)) xa hoi. hieu va cau luc van tuan ((hai cua) OR (dai cua)) tu".
• Adding a wildcard symbol may retrieve word variants: tu sach ((uu nang) or (cuu nong)) xa hoi. hieu va cau luc van tuan ((hai cua) OR (dai cua)) tu*.