Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
tham thuc » nham thuc, tam thuc, thai thuc
nang tai » hang tai, tang tai, sang tai
va thanh » gia thanh, ban thanh, va tinh
dao cua » dai cua, day cua, dan cua
va hanh » van hanh, va danh, ban hanh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
tai hoi » tai khoi, dai hoi, tai hai
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 nang tai hoi. hieu ve ((tham thuc) or (pham thuc)) ((va hanh) OR (va thanh)) dao cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang tai hoi. hieu ve ((tham thuc) OR (pham thuc)) ((va hanh) OR (va thanh)) dao cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang tai hoi. hieu ve ((tham thuc) or (pham thuc)) ((va hanh) OR (va thanh)) dao cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang tai hoi. hieu ve ((tham thuc) or (pham thuc)) ((va hanh) OR (va thanh)) dao cua te*.