Perhaps you should try some spelling variations:
thanh lam » thanh lap, hanh lam, thanh nam
vu khach » vu khanh, vay khach, cua khach
nang hoa » nang hoat, hang hoa, nang hoc
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
su triet » su viet, su tien, ve triet
vu khac » vu kham, vu khanh, bui khac
co sach » bo sach, cuon sach, hoc sach
van bac » van ban, van bao, van hac
lam su » lai su, lam so, lam vu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((vu khach) OR (vu khac))) or (co sach)) ky nang hoa hoc. hieu van bac duc va thanh lam su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((vu khach) OR (vu khac))) OR (co sach)) ky nang hoa hoc. hieu van bac duc va thanh lam su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((vu khach) OR (vu khac))) or (co sach)) ky nang hoa hoc. hieu van bac duc va thanh lam su triet".
• Adding a wildcard symbol may retrieve word variants: ((((vu khach) OR (vu khac))) or (co sach)) ky nang hoa hoc. hieu van bac duc va thanh lam su triet*.