Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
tam thuc » tham thuc, am thuc, nam thuc
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
tang van » dang van, hoang van, trong van
van hoi » van hoa, van hoc, van hoe
sach ky » sach y, sach ty, sach kem
va hanh » van hanh, va danh, ban hanh
van tam » van tham, van tai, van tan
sac ky » cac ky, sai ky
ki su » ky su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((sach ky) or (sac ky)) tang van hoi. hieu van tam thuc ((va hanh) OR (va thanh)) ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ky) OR (sac ky)) tang van hoi. hieu van tam thuc ((va hanh) OR (va thanh)) ki su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach ky) or (sac ky)) tang van hoi. hieu van tam thuc ((va hanh) OR (va thanh)) ki su triet".
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ky) or (sac ky)) tang van hoi. hieu van tam thuc ((va hanh) OR (va thanh)) ki su triet*.