Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
hieu van » hieu va, thien van, lieu va
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
hoc sach » hoc sinh, hoc cac, hoc anh
van pham » san pham, van phan, van phat
hanh di » hanh vi, hanh de, hang di
su sach » vu sach
nang ma » tang ma, sang ma, nang cao
so sach » so sanh, bo sach, co sach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((su sach) or (so sach))) or (hoc sach)) ky nang ma hoi. hieu van pham thuc dan hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((su sach) OR (so sach))) OR (hoc sach)) ky nang ma hoi. hieu van pham thuc dan hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((((su sach) or (so sach))) or (hoc sach)) ky nang ma hoi. hieu van pham thuc dan hanh di cua tre*.