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