Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
dua tren » dung tren
thanh va » thanh van, hanh va, thanh ha
su triet » su viet, su tien, ve triet
va cham » va chat, va tham
thuc va » thuc vat, thuc dan, thuc day
nang ma » tang ma, sang ma, nang cao
vu sach » vu bach, su sach, vu khach
ve cac » va cac, vien cac
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: vu sach y nang ma hoa. hieu ((ve cac) or (va cham)) thuc va thanh va ((dua tren) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang ma hoa. hieu ((ve cac) OR (va cham)) thuc va thanh va ((dua tren) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: vu sach y nang ma hoa. hieu ((ve cac) or (va cham)) thuc va thanh va ((dua tren) or (su triet))*.