Perhaps you should try some spelling variations:
duc tren » duoc tren, dua tren, duc tien
nhan luc » nang luc
toc sach » hoc sach, doc sach, thuoc sach
van nhan » van phan, van thanh, danh nhan
hieu van » hieu va, thien van, lieu va
nang di » nang du, hang di, nang ji
luc cam » luc lam, luc tam, xuc cam
tu sach » thu sach, su sach, tu cach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
di duc » do duc, di du, oi duc

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 (((te sach) OR (toc sach)))) ky lang xa hoi. hieu van nhan luc cam nang di duc tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((te sach) OR (toc sach)))) ky lang xa hoi. hieu van nhan luc cam nang di duc tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (((te sach) OR (toc sach)))) ky lang xa hoi. hieu van nhan luc cam nang di duc tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((te sach) OR (toc sach)))) ky lang xa hoi. hieu van nhan luc cam nang di duc tren*.