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

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 chau 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 chau 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 chau tren*.