Perhaps you should try some spelling variations:
tham thuc » tam thuc, thai thuc, thach thuc
pham thuc » phap thuc, pham chuc, pham thu
nham thuc » nhan thuc, nam thuc, nham thu
tang van » dang van, hoang van, trong van
su sach » so sach, vu sach
hanh de » hanh ve, hanh kem
ky tang » ky nang, ky dang, kho tang
van hoi » van hoa, van hoc, van hoe
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
de cua » le cua, te cua, dieu cua
cua te » cua tu

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 ky tang van hoi. lieu va ((tham thuc) or (((pham thuc) OR (nham thuc)))) va hanh de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky tang van hoi. lieu va ((tham thuc) OR (((pham thuc) OR (nham thuc)))) va hanh de cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky tang van hoi. lieu va ((tham thuc) or (((pham thuc) OR (nham thuc)))) va hanh de cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ky tang van hoi. lieu va ((tham thuc) or (((pham thuc) OR (nham thuc)))) va hanh de cua te*.