Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham duc » pham duc, cham soc, pham duy
su triet » su viet, su tien, ve triet
te sach » toc sach
ky tang » ky nang, ky dang, kho tang
va danh » va dinh, va dan, va hanh
danh tu » anh tu, doanh thu
y tang » 6 tang, 7 tang, 5 tang
ma hoi » mai hoi, ma hoa, me hoi
tu su » tu sua, tu so, tu tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((y tang) OR (ky tang)) ((ma hoi) or (xa hoi)). hieu van cham duc va danh tu su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y tang) OR (ky tang)) ((ma hoi) OR (xa hoi)). hieu van cham duc va danh tu su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y tang) OR (ky tang)) ((ma hoi) or (xa hoi)). hieu van cham duc va danh tu su triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((y tang) OR (ky tang)) ((ma hoi) or (xa hoi)). hieu van cham duc va danh tu su triet*.