Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
sang mai » sang ma, sang tai, lang mai
van lam » van nam
cu tren » tu tren, dua tren
mai hoi » mai khoi, dai hoi, lai hoi
y sang » _ sang, duy sang
loc va » hoc va, luc va
va dan » ca dan, va dao, va dau
dan du » dan dau, danh du, dan su
va lam » va lap
du cu » cu cu, su cu, da cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu hoach) or (thuoc sach)) y sang mai hoi. hieu ((va lam) or (van lam)) loc va dan du cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu hoach) OR (thuoc sach)) y sang mai hoi. hieu ((va lam) OR (van lam)) loc va dan du cu tren.
• Adding a wildcard symbol may retrieve word variants: ((thu hoach) or (thuoc sach)) y sang mai hoi. hieu ((va lam) or (van lam)) loc va dan du cu tren*.