Perhaps you should try some spelling variations:
thien van » thi van
cam thuc » nam thuc, cam thu, can thuc
vat danh » va danh, van danh, luat danh
hai chau » lai chau, ha chau, hat chau
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
hai chu » hoi chu, hai chi, hai phu

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 ly nang xa hoi. thien van ((cam thuc) OR (am thuc)) vat danh ((hai chu) or (hai chau)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang xa hoi. thien van ((cam thuc) OR (am thuc)) vat danh ((hai chu) OR (hai chau)) treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly nang xa hoi. thien van ((cam thuc) OR (am thuc)) vat danh ((hai chu) or (hai chau)) treo".
• Adding a wildcard symbol may retrieve word variants: su sach ly nang xa hoi. thien van ((cam thuc) OR (am thuc)) vat danh ((hai chu) or (hai chau)) treo*.