Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
duc minh » duc anh
hanh dai » hanh tai, hanh dao, vanh dai
va triet » va trien, ve triet, cua triet
duc van » duc va, duc tan, duc manh
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang x hoi. hieu van pham ((duc van) or (duc minh)) hanh dai ((va triet) OR (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang x hoi. hieu van pham ((duc van) OR (duc minh)) hanh dai ((va triet) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang x hoi. hieu van pham ((duc van) or (duc minh)) hanh dai ((va triet) OR (va thiet))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x hoi. hieu van pham ((duc van) or (duc minh)) hanh dai ((va triet) OR (va thiet))*.