Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
kinh cau » sinh cau, kinh can, minh cau
cau tren » cu tren, dau tren, ca tren
tu sach » su sach, te sach, tu cach
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
cao duc » dao duc, cao suc, tao duoc
va than » va thanh, van than, va phan

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)) ty nang x ho. hieu va ((cao duc) or (giao duc)) va than kinh cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty nang x ho. hieu va ((cao duc) OR (giao duc)) va than kinh cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ty nang x ho. hieu va ((cao duc) or (giao duc)) va than kinh cau tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ty nang x ho. hieu va ((cao duc) or (giao duc)) va than kinh cau tren*.