Perhaps you should try some spelling variations:
hanh minh » thanh minh, hinh minh, hanh tinh
minh cau » minh chau, sinh cau, minh can
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va
cao suc » cao su, cao duc
va hanh » van hanh, va thanh, va danh

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