Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
va triet » va thiet, va trien, ve triet
cham tuc » nham thuc, tham thuc, cham soc
hanh dao » lanh dao, thanh dat, thanh dam
vu khach » vu khanh, vu khac, vay khach
dao tang » dao trang, cao tang, dam tang
va hanh » van hanh, va thanh, va danh
vu sach » vu bach, su sach
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
dao va » dao van, tao va, do va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) OR (vu khach)) dao tang xa hoi. hieu ve ((cham tuc) or (pham thuc)) va hanh dao va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) dao tang xa hoi. hieu ve ((cham tuc) OR (pham thuc)) va hanh dao va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu khach)) dao tang xa hoi. hieu ve ((cham tuc) or (pham thuc)) va hanh dao va triet".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (vu khach)) dao tang xa hoi. hieu ve ((cham tuc) or (pham thuc)) va hanh dao va triet*.