Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cua triet » cua viet, su triet, va triet
viec cac » viec cua, viec lam, viec va
vien cac » vien bach, vien dai, vien da
thanh va » thanh van, hanh va, thanh ha
y nang » ky nang, ly nang, v nang
lo van » vo van, so van, do van
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach y nang x ho. hieu ((viec cac) or (vien cac)) ((lo van) OR (le van)) thanh va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y nang x ho. hieu ((viec cac) OR (vien cac)) ((lo van) OR (le van)) thanh va cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y nang x ho. hieu ((viec cac) or (vien cac)) ((lo van) OR (le van)) thanh va cua triet".
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang x ho. hieu ((viec cac) or (vien cac)) ((lo van) OR (le van)) thanh va cua triet*.