Perhaps you should try some spelling variations:
tue nhan » cu nhan
luc nhan » luc nhat, cu nhan, luc luan
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, hieu qua
hang ve » hang va, hanh ve, hang ke
va cau » van cau, va cac, va dau
ve cau » ke cau, ve cac, le cau

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 cau ((luc nhan) OR (tue nhan)) hang ve cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x ho. hieu va cau ((luc nhan) OR (tue nhan)) hang ve cau tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x ho. hieu va cau ((luc nhan) OR (tue nhan)) hang ve cau tren*.