Perhaps you should try some spelling variations:
tham thuc » nham thuc, tam thuc, thai thuc
pham thuc » phap thuc, pham chuc, nham thuc
thanh ve » hanh ve, thanh va, thanh vien
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
ve cua » le cua, de cua, te cua
su sac » su cac, su xac
ma hoi » mai hoi, xa hoi, ma hoa
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 sac) OR (su sach)) ky tang ma hoi. lieu va ((tham thuc) or (pham thuc)) va thanh ve cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su sach)) ky tang ma hoi. lieu va ((tham thuc) OR (pham thuc)) va thanh ve cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) OR (su sach)) ky tang ma hoi. lieu va ((tham thuc) or (pham thuc)) va thanh ve cua te".
• Adding a wildcard symbol may retrieve word variants: ((su sac) OR (su sach)) ky tang ma hoi. lieu va ((tham thuc) or (pham thuc)) va thanh ve cua te*.