Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
hieu van » hieu va, thien van, hieu ve
thu sach » thuat sach, thuoc sach, thu hoach
va thanh » gia thanh, ban thanh, va tinh
thanh do » thanh de, thanh pho, thanh hoa
su triet » su viet, su tien, ve triet
tu sach » su sach, te sach, tu cach
thuc va » thuc vat, thuc dan, thuc day
y nang » ky nang, ly nang, v nang
do su » do sut, do tu, co su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) y nang x ho. ((hieu van) OR (lieu va)) pham thuc va thanh do su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang x ho. ((hieu van) OR (lieu va)) pham thuc va thanh do su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) y nang x ho. ((hieu van) OR (lieu va)) pham thuc va thanh do su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y nang x ho. ((hieu van) OR (lieu va)) pham thuc va thanh do su triet*.