Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
tang van » dang van, hoang van, trong van
hanh hai » thanh hai, nhanh hai, hang hai
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
cu tren » tu tren, dua tren
y tang » ky tang, 6 tang, 7 tang
hai cu » hai cua, hai chu, hai cuc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y tang van hoa. hieu ve ((cham soc) or (tham thuc)) va hanh hai cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y tang van hoa. hieu ve ((cham soc) OR (tham thuc)) va hanh hai cu tren.
• Adding a wildcard symbol may retrieve word variants: tu sach y tang van hoa. hieu ve ((cham soc) or (tham thuc)) va hanh hai cu tren*.