Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cua triet » cua viet, su triet, va triet
tang van » dang van, hoang van, trong van
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
cap van » cac van, tap van, cap va
cao van » cac van, dao van, cao dang
hanh di » hanh vi, hanh de, hang di
van bac » van ban, van bao, van hac
di cua » dai cua, doi cua, de 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 ky ((nang x) or (tang van)) hoi. hieu van bac ((cap van) OR (cao van)) hanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((nang x) OR (tang van)) hoi. hieu van bac ((cap van) OR (cao van)) hanh di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky ((nang x) or (tang van)) hoi. hieu van bac ((cap van) OR (cao van)) hanh di cua triet".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((nang x) or (tang van)) hoi. hieu van bac ((cap van) OR (cao van)) hanh di cua triet*.