Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
cau tren » cu tren, dau tren, ca tren
danh hai » dang hai, lanh hai, manh hai
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
la tren » loai tren, dua tren, dat tren
sach ly » sach y, sach lo, sach ty
van lam » van nam
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
ma hoi » mai hoi, xa hoi, ma hoa

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 ma hoi. hieu van lam ((tuc xa) or (thuc dan)) danh hai ((cau tren) or (la tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang ma hoi. hieu van lam ((tuc xa) OR (thuc dan)) danh hai ((cau tren) OR (la tren)).
• Adding a wildcard symbol may retrieve word variants: su sach ly nang ma hoi. hieu van lam ((tuc xa) or (thuc dan)) danh hai ((cau tren) or (la tren))*.