Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cham thuc » nham thuc, pham thuc, pham thuoc
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
thanh vi » hanh vi, thanh va, thanh ve
vu sach » vu bach, su sach, vu khach
hoc cac » hoc cao
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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) or (hoc cac)) ky nang xa hoi. hieu van ((cham thuc) or (tham thuc)) va thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (hoc cac)) ky nang xa hoi. hieu van ((cham thuc) OR (tham thuc)) va thanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (hoc cac)) ky nang xa hoi. hieu van ((cham thuc) or (tham thuc)) va thanh vi cua tre*.