Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
pham thuc » phap thuc, pham chuc, nham thuc
van pham » san pham, van phan, van phat
ve triet » su triet
thanh do » thanh de, thanh pho, thanh hoa
va thanh » gia thanh, ban thanh, va tinh
va trien » va truyen, va thiet, va tuyen
hieu van » hieu va, thien van, lieu va
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, su sach, te sach
y nang » ky nang, ly nang, v nang

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