Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
thuc chan » thuc can, thuc nhan, thuc phan
chan danh » han danh, chan dang, chinh danh
danh kien » dinh kien, danh viet, linh kien
kien cua » khien cua, dien cua, tien cua
doc sac » doc sach, dac sac, hoc sach
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sac ky nang xa hoi. ((hieu va) or (lieu va)) tham thuc chan danh kien cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sac ky nang xa hoi. ((hieu va) OR (lieu va)) tham thuc chan danh kien cua tre.
• Adding a wildcard symbol may retrieve word variants: doc sac ky nang xa hoi. ((hieu va) or (lieu va)) tham thuc chan danh kien cua tre*.