Perhaps you should try some spelling variations:
tue nhan » cu nhan
luc nhan » luc nhat, cu nhan, luc luan
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
cu tren » tu tren, dua tren
va cau » van cau, va cac, va dau
ve cu » ve cau, ve chu, ve cua

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 cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x ho. hieu va cau ((luc nhan) OR (tue nhan)) hang ve cu 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 cu tren*.