Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
dua tren » dung tren
hieu va » lieu va, hieu qua
cac tac » cac toc, cac bac, cac dac
va danh » va dinh, va dan, va hanh
danh ca » dan ca, doanh cua, danh cho
y nang » ky nang, ly nang, v nang
tac va » tac da, tac xa, tuc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang ((le hoi) or (ma hoa)). hieu va cac tac va danh ca ((dua tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ((le hoi) OR (ma hoa)). hieu va cac tac va danh ca ((dua tren) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ((le hoi) or (ma hoa)). hieu va cac tac va danh ca ((dua tren) or (cua triet))*.